diff --git a/launcher/Application.cpp b/launcher/Application.cpp
index 6dd01519..318b59f6 100644
--- a/launcher/Application.cpp
+++ b/launcher/Application.cpp
@@ -242,7 +242,11 @@ Application::Application(int &argc, char **argv) : QApplication(argc, argv)
         // --server
         parser.addOption("server");
         parser.addShortOpt("server", 's');
-        parser.addDocumentation("server", "Join the specified server on launch (only valid in combination with --launch)");
+        parser.addDocumentation("server", "Join the specified server on launch (only valid in combination with --launch, mutually exclusive with --world)");
+        // --world
+        parser.addOption("world");
+        parser.addShortOpt("world", 'w');
+        parser.addDocumentation("world", "Join the singleplayer world with the specified folder name on launch (only valid in combination with --launch, mutually exclusive with --server, only works with Minecraft 23w14a and later)");
         // --profile
         parser.addOption("profile");
         parser.addShortOpt("profile", 'a');
@@ -297,6 +301,7 @@ Application::Application(int &argc, char **argv) : QApplication(argc, argv)
     }
     m_instanceIdToLaunch = args["launch"].toString();
     m_serverToJoin = args["server"].toString();
+    m_worldToJoin = args["world"].toString();
     m_profileToUse = args["profile"].toString();
     if(args["offline"].toBool()) {
         m_offline = true;
@@ -367,6 +372,14 @@ Application::Application(int &argc, char **argv) : QApplication(argc, argv)
         return;
     }
 
+    // --world and --server can't be used together
+    if(!m_worldToJoin.isEmpty() && !m_serverToJoin.isEmpty())
+    {
+        std::cerr << "--server and --world are mutually exclusive!" << std::endl;
+        m_status = Application::Failed;
+        return;
+    }
+
     // all the things invalid when NOT trying to --launch
     if(m_instanceIdToLaunch.isEmpty()) {
         if(!m_serverToJoin.isEmpty())
@@ -376,6 +389,13 @@ Application::Application(int &argc, char **argv) : QApplication(argc, argv)
             return;
         }
 
+        if(!m_worldToJoin.isEmpty())
+        {
+            std::cerr << "--world can only be used in combination with --launch!" << std::endl;
+            m_status = Application::Failed;
+            return;
+        }
+
         if(!m_profileToUse.isEmpty())
         {
             std::cerr << "--account can only be used in combination with --launch!" << std::endl;
@@ -507,6 +527,10 @@ Application::Application(int &argc, char **argv) : QApplication(argc, argv)
                 {
                     launch.args["server"] = m_serverToJoin;
                 }
+                if(!m_worldToJoin.isEmpty())
+                {
+                    launch.args["world"] = m_worldToJoin;
+                }
                 if(!m_profileToUse.isEmpty())
                 {
                     launch.args["profile"] = m_profileToUse;
@@ -599,6 +623,10 @@ Application::Application(int &argc, char **argv) : QApplication(argc, argv)
         {
             qDebug() << "Address of server to join  :" << m_serverToJoin;
         }
+        if(!m_worldToJoin.isEmpty())
+        {
+            qDebug() << "Name of world to join      :" << m_worldToJoin;
+        }
         qDebug() << "<> Paths set.";
     }
 
@@ -1070,7 +1098,7 @@ void Application::performMainStartupAction()
         auto inst = instances()->getInstanceById(m_instanceIdToLaunch);
         if(inst)
         {
-            MinecraftServerTargetPtr serverToJoin = nullptr;
+            QuickPlayTargetPtr serverOrWorldToJoin = nullptr;
             MinecraftAccountPtr accountToUse = nullptr;
             bool offline = m_offline;
 
@@ -1078,10 +1106,16 @@ void Application::performMainStartupAction()
             if(!m_serverToJoin.isEmpty())
             {
                 // FIXME: validate the server string
-                serverToJoin.reset(new MinecraftServerTarget(MinecraftServerTarget::parse(m_serverToJoin)));
+                serverOrWorldToJoin.reset(new QuickPlayTarget(QuickPlayTarget::parseMultiplayer(m_serverToJoin)));
                 qDebug() << "   Launching with server" << m_serverToJoin;
             }
 
+            if(!m_worldToJoin.isEmpty())
+            {
+                serverOrWorldToJoin.reset(new QuickPlayTarget(QuickPlayTarget::parseSingleplayer(m_worldToJoin)));
+                qDebug() << "   Launching with world" << m_worldToJoin;
+            }
+
             if(!m_profileToUse.isEmpty())
             {
                 accountToUse = accounts()->getAccountByProfileName(m_profileToUse);
@@ -1091,7 +1125,7 @@ void Application::performMainStartupAction()
                 qDebug() << "   Launching with account" << m_profileToUse;
             }
 
-            launch(inst, !offline, nullptr, serverToJoin, accountToUse, m_offlineName);
+            launch(inst, !offline, nullptr, serverOrWorldToJoin, accountToUse, m_offlineName);
             return;
         }
     }
@@ -1180,9 +1214,9 @@ void Application::messageReceived(const QByteArray& message)
             return;
         }
 
-        MinecraftServerTargetPtr serverObject = nullptr;
+        QuickPlayTargetPtr serverObject = nullptr;
         if(!server.isEmpty()) {
-            serverObject = std::make_shared<MinecraftServerTarget>(MinecraftServerTarget::parse(server));
+            serverObject = std::make_shared<QuickPlayTarget>(QuickPlayTarget::parseMultiplayer(server));
         }
 
         MinecraftAccountPtr accountObject;
@@ -1297,7 +1331,7 @@ bool Application::launch(
         InstancePtr instance,
         bool online,
         BaseProfilerFactory *profiler,
-        MinecraftServerTargetPtr serverToJoin,
+        QuickPlayTargetPtr quickPlayTarget,
         MinecraftAccountPtr accountToUse,
         const QString& offlineName
 ) {
@@ -1321,7 +1355,7 @@ bool Application::launch(
         controller->setInstance(instance);
         controller->setOnline(online);
         controller->setProfiler(profiler);
-        controller->setServerToJoin(serverToJoin);
+        controller->setQuickPlayTarget(quickPlayTarget);
         controller->setAccountToUse(accountToUse);
         controller->setOfflineName(offlineName);
         if(window)
diff --git a/launcher/Application.h b/launcher/Application.h
index f9e523f9..1de5327c 100644
--- a/launcher/Application.h
+++ b/launcher/Application.h
@@ -11,7 +11,7 @@
 
 #include <BaseInstance.h>
 
-#include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/launch/QuickPlayTarget.h"
 
 class LaunchController;
 class LocalPeer;
@@ -150,12 +150,12 @@ signals:
 
 public slots:
     bool launch(
-        InstancePtr instance,
-        bool online = true,
-        BaseProfilerFactory *profiler = nullptr,
-        MinecraftServerTargetPtr serverToJoin = nullptr,
-        MinecraftAccountPtr accountToUse = nullptr,
-        const QString &offlineName = QString()
+            InstancePtr instance,
+            bool online = true,
+            BaseProfilerFactory *profiler = nullptr,
+            QuickPlayTargetPtr quickPlayTarget = nullptr,
+            MinecraftAccountPtr accountToUse = nullptr,
+            const QString &offlineName = QString()
     );
     bool kill(InstancePtr instance);
 
@@ -234,6 +234,7 @@ private:
 public:
     QString m_instanceIdToLaunch;
     QString m_serverToJoin;
+    QString m_worldToJoin;
     QString m_profileToUse;
     bool m_offline = false;
     QString m_offlineName;
diff --git a/launcher/BaseInstance.h b/launcher/BaseInstance.h
index c148f37e..4e8b4b83 100644
--- a/launcher/BaseInstance.h
+++ b/launcher/BaseInstance.h
@@ -33,7 +33,7 @@
 
 #include "net/Mode.h"
 
-#include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/launch/QuickPlayTarget.h"
 
 class QDir;
 class Task;
@@ -161,7 +161,7 @@ public:
 
     /// returns a valid launcher (task container)
     virtual shared_qobject_ptr<LaunchTask> createLaunchTask(
-            AuthSessionPtr account, MinecraftServerTargetPtr serverToJoin) = 0;
+            AuthSessionPtr account, QuickPlayTargetPtr quickPlayTarget) = 0;
 
     /// returns the current launch task (if any)
     shared_qobject_ptr<LaunchTask> getLaunchTask();
@@ -239,7 +239,7 @@ public:
     /**
      * 'print' a verbose description of the instance into a QStringList
      */
-    virtual QStringList verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin) = 0;
+    virtual QStringList verboseDescription(AuthSessionPtr session, QuickPlayTargetPtr quickPlayTarget) = 0;
 
     Status currentStatus() const;
 
diff --git a/launcher/CMakeLists.txt b/launcher/CMakeLists.txt
index 95db0882..c6204c09 100644
--- a/launcher/CMakeLists.txt
+++ b/launcher/CMakeLists.txt
@@ -269,8 +269,8 @@ set(MINECRAFT_SOURCES
     minecraft/launch/ExtractNatives.h
     minecraft/launch/LauncherPartLaunch.cpp
     minecraft/launch/LauncherPartLaunch.h
-    minecraft/launch/MinecraftServerTarget.cpp
-    minecraft/launch/MinecraftServerTarget.h
+    minecraft/launch/QuickPlayTarget.cpp
+    minecraft/launch/QuickPlayTarget.h
     minecraft/launch/PrintInstanceInfo.cpp
     minecraft/launch/PrintInstanceInfo.h
     minecraft/launch/ReconstructAssets.cpp
diff --git a/launcher/InstancePageProvider.h b/launcher/InstancePageProvider.h
index 2af90b91..76d183f6 100644
--- a/launcher/InstancePageProvider.h
+++ b/launcher/InstancePageProvider.h
@@ -45,7 +45,7 @@ public:
             values.append(new TexturePackPage(onesix.get()));
             values.append(new ShaderPackPage(onesix.get()));
             values.append(new NotesPage(onesix.get()));
-            values.append(new WorldListPage(onesix.get(), onesix->worldList()));
+            values.append(new WorldListPage(onesix, onesix->worldList()));
             values.append(new ServersPage(onesix));
             // values.append(new GameOptionsPage(onesix.get()));
             values.append(new ScreenshotsPage(FS::PathCombine(onesix->gameRoot(), "screenshots")));
@@ -56,7 +56,7 @@ public:
         {
             values.append(new LegacyUpgradePage(legacy));
             values.append(new NotesPage(legacy.get()));
-            values.append(new WorldListPage(legacy.get(), legacy->worldList()));
+            values.append(new WorldListPage(legacy, legacy->worldList()));
             values.append(new ScreenshotsPage(FS::PathCombine(legacy->gameRoot(), "screenshots")));
         }
         auto logMatcher = inst->getLogFileMatcher();
diff --git a/launcher/LaunchController.cpp b/launcher/LaunchController.cpp
index 32c5f49b..597eb4c0 100644
--- a/launcher/LaunchController.cpp
+++ b/launcher/LaunchController.cpp
@@ -321,7 +321,7 @@ void LaunchController::launchInstance()
         return;
     }
 
-    m_launcher = m_instance->createLaunchTask(m_session, m_serverToJoin);
+    m_launcher = m_instance->createLaunchTask(m_session, m_quickPlayTarget);
     if (!m_launcher)
     {
         emitFailed(tr("Couldn't instantiate a launcher."));
diff --git a/launcher/LaunchController.h b/launcher/LaunchController.h
index 53a704c0..cb99dc27 100644
--- a/launcher/LaunchController.h
+++ b/launcher/LaunchController.h
@@ -3,7 +3,7 @@
 #include <BaseInstance.h>
 #include <tools/BaseProfiler.h>
 
-#include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/launch/QuickPlayTarget.h"
 #include "minecraft/auth/MinecraftAccount.h"
 
 class InstanceWindow;
@@ -40,8 +40,8 @@ public:
         m_parentWidget = widget;
     }
 
-    void setServerToJoin(MinecraftServerTargetPtr serverToJoin) {
-        m_serverToJoin = std::move(serverToJoin);
+    void setQuickPlayTarget(QuickPlayTargetPtr quickPlayTarget) {
+        m_quickPlayTarget = std::move(quickPlayTarget);
     }
 
     void setAccountToUse(MinecraftAccountPtr accountToUse) {
@@ -77,5 +77,5 @@ private:
     MinecraftAccountPtr m_accountToUse = nullptr;
     AuthSessionPtr m_session;
     shared_qobject_ptr<LaunchTask> m_launcher;
-    MinecraftServerTargetPtr m_serverToJoin;
+    QuickPlayTargetPtr m_quickPlayTarget;
 };
diff --git a/launcher/NullInstance.h b/launcher/NullInstance.h
index ed421433..2a777966 100644
--- a/launcher/NullInstance.h
+++ b/launcher/NullInstance.h
@@ -27,7 +27,7 @@ public:
     {
         return instanceRoot();
     };
-    shared_qobject_ptr<LaunchTask> createLaunchTask(AuthSessionPtr, MinecraftServerTargetPtr) override
+    shared_qobject_ptr<LaunchTask> createLaunchTask(AuthSessionPtr, QuickPlayTargetPtr) override
     {
         return nullptr;
     }
@@ -67,7 +67,7 @@ public:
     {
         return false;
     }
-    QStringList verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin) override
+    QStringList verboseDescription(AuthSessionPtr session, QuickPlayTargetPtr quickPlayTarget) override
     {
         QStringList out;
         out << "Null instance - placeholder.";
diff --git a/launcher/launch/steps/LookupServerAddress.cpp b/launcher/launch/steps/LookupServerAddress.cpp
index c7b8cea4..de59af54 100644
--- a/launcher/launch/steps/LookupServerAddress.cpp
+++ b/launcher/launch/steps/LookupServerAddress.cpp
@@ -32,7 +32,7 @@ void LookupServerAddress::setLookupAddress(const QString &lookupAddress)
     m_dnsLookup->setName(QString("_minecraft._tcp.%1").arg(lookupAddress));
 }
 
-void LookupServerAddress::setOutputAddressPtr(MinecraftServerTargetPtr output)
+void LookupServerAddress::setOutputAddressPtr(QuickPlayTargetPtr output)
 {
     m_output = std::move(output);
 }
diff --git a/launcher/launch/steps/LookupServerAddress.h b/launcher/launch/steps/LookupServerAddress.h
index 5a5c3de1..4966b30e 100644
--- a/launcher/launch/steps/LookupServerAddress.h
+++ b/launcher/launch/steps/LookupServerAddress.h
@@ -19,7 +19,7 @@
 #include <QObjectPtr.h>
 #include <QDnsLookup>
 
-#include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/launch/QuickPlayTarget.h"
 
 class LookupServerAddress: public LaunchStep {
 Q_OBJECT
@@ -35,7 +35,7 @@ public:
     }
 
     void setLookupAddress(const QString &lookupAddress);
-    void setOutputAddressPtr(MinecraftServerTargetPtr output);
+    void setOutputAddressPtr(QuickPlayTargetPtr output);
 
 private slots:
     void on_dnsLookupFinished();
@@ -45,5 +45,5 @@ private:
 
     QDnsLookup *m_dnsLookup;
     QString m_lookupAddress;
-    MinecraftServerTargetPtr m_output;
+    QuickPlayTargetPtr m_output;
 };
diff --git a/launcher/minecraft/MinecraftInstance.cpp b/launcher/minecraft/MinecraftInstance.cpp
index 19256e30..2c7d8558 100644
--- a/launcher/minecraft/MinecraftInstance.cpp
+++ b/launcher/minecraft/MinecraftInstance.cpp
@@ -122,8 +122,11 @@ MinecraftInstance::MinecraftInstance(SettingsObjectPtr globalSettings, SettingsO
     m_settings->registerOverride(globalSettings->getSetting("RecordGameTime"), gameTimeOverride);
 
     // Join server on launch, this does not have a global override
+    m_settings->registerSetting("JoinWorldOnLaunch", false);
     m_settings->registerSetting("JoinServerOnLaunch", false);
     m_settings->registerSetting("JoinServerOnLaunchAddress", "");
+    m_settings->registerSetting("JoinSingleplayerWorldOnLaunch", false);
+    m_settings->registerSetting("JoinSingleplayerWorldOnLaunchName", "");
 
     // DEPRECATED: Read what versions the user configuration thinks should be used
     m_settings->registerSetting({"IntendedVersion", "MinecraftVersion"}, "");
@@ -415,7 +418,7 @@ static QString replaceTokensIn(QString text, QMap<QString, QString> with)
 }
 
 QStringList MinecraftInstance::processMinecraftArgs(
-        AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin) const
+        AuthSessionPtr session, QuickPlayTargetPtr quickPlayTarget) const
 {
     auto profile = m_components->getProfile();
     QString args_pattern = profile->getMinecraftArguments();
@@ -424,18 +427,23 @@ QStringList MinecraftInstance::processMinecraftArgs(
         args_pattern += " --tweakClass " + tweaker;
     }
 
-    if (serverToJoin && !serverToJoin->address.isEmpty())
+    if (quickPlayTarget && !quickPlayTarget->address.isEmpty())
     {
         if (m_components->getComponent("net.minecraft")->getReleaseDateTime() >= g_VersionFilterData.quickPlayBeginsDate)
         {
-            args_pattern += " --quickPlayMultiplayer " + serverToJoin->address + ":" + QString::number(serverToJoin->port);
+            args_pattern += " --quickPlayMultiplayer " + quickPlayTarget->address + ":" + QString::number(quickPlayTarget->port);
         }
         else
         {
-            args_pattern += " --server " + serverToJoin->address;
-            args_pattern += " --port " + QString::number(serverToJoin->port);
+            args_pattern += " --server " + quickPlayTarget->address;
+            args_pattern += " --port " + QString::number(quickPlayTarget->port);
         }
     }
+
+    if (quickPlayTarget && quickPlayTarget->world.isEmpty())
+    {
+        args_pattern += " --quickPlaySingleplayer \"" + quickPlayTarget->world + "\"";
+    }
     
     QMap<QString, QString> token_mapping;
     // yggdrasil!
@@ -474,7 +482,7 @@ QStringList MinecraftInstance::processMinecraftArgs(
     return parts;
 }
 
-QString MinecraftInstance::createLaunchScript(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin)
+QString MinecraftInstance::createLaunchScript(AuthSessionPtr session, QuickPlayTargetPtr quickPlayTarget)
 {
     QString launchScript;
 
@@ -495,17 +503,22 @@ QString MinecraftInstance::createLaunchScript(AuthSessionPtr session, MinecraftS
         launchScript += "appletClass " + appletClass + "\n";
     }
 
-    if (serverToJoin && !serverToJoin->address.isEmpty())
+    if (quickPlayTarget && !quickPlayTarget->address.isEmpty())
     {
         launchScript += "useQuickPlay " + QString::number(m_components->getComponent("net.minecraft")->getReleaseDateTime() >= g_VersionFilterData.quickPlayBeginsDate) + "\n";
-        launchScript += "serverAddress " + serverToJoin->address + "\n";
-        launchScript += "serverPort " + QString::number(serverToJoin->port) + "\n";
+        launchScript += "serverAddress " + quickPlayTarget->address + "\n";
+        launchScript += "serverPort " + QString::number(quickPlayTarget->port) + "\n";
+    }
+
+    if (quickPlayTarget && !quickPlayTarget->world.isEmpty())
+    {
+        launchScript += "joinWorld " + quickPlayTarget->world + "\n";
     }
 
     // generic minecraft params
     for (auto param : processMinecraftArgs(
             session,
-            nullptr /* When using a launch script, the server parameters are handled by it*/
+            nullptr /* When using a launch script, the server and world parameters are handled by it*/
     ))
     {
         launchScript += "param " + param + "\n";
@@ -558,7 +571,7 @@ QString MinecraftInstance::createLaunchScript(AuthSessionPtr session, MinecraftS
     return launchScript;
 }
 
-QStringList MinecraftInstance::verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin)
+QStringList MinecraftInstance::verboseDescription(AuthSessionPtr session, QuickPlayTargetPtr quickPlayTarget)
 {
     QStringList out;
     out << "Main Class:" << "  " + getMainClass() << "";
@@ -673,7 +686,7 @@ QStringList MinecraftInstance::verboseDescription(AuthSessionPtr session, Minecr
         out << "";
     }
 
-    auto params = processMinecraftArgs(nullptr, serverToJoin);
+    auto params = processMinecraftArgs(nullptr, quickPlayTarget);
     out << "Params:";
     out << "  " + params.join(' ');
     out << "";
@@ -834,7 +847,7 @@ Task::Ptr MinecraftInstance::createUpdateTask(Net::Mode mode)
     return nullptr;
 }
 
-shared_qobject_ptr<LaunchTask> MinecraftInstance::createLaunchTask(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin)
+shared_qobject_ptr<LaunchTask> MinecraftInstance::createLaunchTask(AuthSessionPtr session, QuickPlayTargetPtr quickPlayTarget)
 {
     // FIXME: get rid of shared_from_this ...
     auto process = LaunchTask::create(std::dynamic_pointer_cast<MinecraftInstance>(shared_from_this()));
@@ -866,18 +879,26 @@ shared_qobject_ptr<LaunchTask> MinecraftInstance::createLaunchTask(AuthSessionPt
         process->appendStep(new CreateGameFolders(pptr));
     }
 
-    if (!serverToJoin && m_settings->get("JoinServerOnLaunch").toBool())
+    if (!quickPlayTarget && m_settings->get("JoinWorldOnLaunch").toBool())
     {
-        QString fullAddress = m_settings->get("JoinServerOnLaunchAddress").toString();
-        serverToJoin.reset(new MinecraftServerTarget(MinecraftServerTarget::parse(fullAddress)));
+        if (m_settings->get("JoinServerOnLaunch").toBool())
+        {
+            QString fullAddress = m_settings->get("JoinServerOnLaunchAddress").toString();
+            quickPlayTarget.reset(new QuickPlayTarget(QuickPlayTarget::parseMultiplayer(fullAddress)));
+        }
+        else if (m_settings->get("JoinSingleplayerWorldOnLaunch").toBool())
+        {
+            QString worldName = m_settings->get("JoinSingleplayerWorldOnLaunchName").toString();
+            quickPlayTarget.reset(new QuickPlayTarget(QuickPlayTarget::parseSingleplayer(worldName)));
+        }
     }
 
-    if(serverToJoin && serverToJoin->port == 25565)
+    if(quickPlayTarget && quickPlayTarget->port == 25565)
     {
         // Resolve server address to join on launch
         auto *step = new LookupServerAddress(pptr);
-        step->setLookupAddress(serverToJoin->address);
-        step->setOutputAddressPtr(serverToJoin);
+        step->setLookupAddress(quickPlayTarget->address);
+        step->setOutputAddressPtr(quickPlayTarget);
         process->appendStep(step);
     }
 
@@ -914,7 +935,7 @@ shared_qobject_ptr<LaunchTask> MinecraftInstance::createLaunchTask(AuthSessionPt
 
     // print some instance info here...
     {
-        process->appendStep(new PrintInstanceInfo(pptr, session, serverToJoin));
+        process->appendStep(new PrintInstanceInfo(pptr, session, quickPlayTarget));
     }
 
     // extract native jars if needed
@@ -940,7 +961,7 @@ shared_qobject_ptr<LaunchTask> MinecraftInstance::createLaunchTask(AuthSessionPt
             auto step = new LauncherPartLaunch(pptr);
             step->setWorkingDirectory(gameRoot());
             step->setAuthSession(session);
-            step->setServerToJoin(serverToJoin);
+            step->setQuickPlayTarget(quickPlayTarget);
             process->appendStep(step);
         }
         else if (method == "DirectJava")
@@ -948,7 +969,7 @@ shared_qobject_ptr<LaunchTask> MinecraftInstance::createLaunchTask(AuthSessionPt
             auto step = new DirectJavaLaunch(pptr);
             step->setWorkingDirectory(gameRoot());
             step->setAuthSession(session);
-            step->setServerToJoin(serverToJoin);
+            step->setQuickPlayTarget(quickPlayTarget);
             process->appendStep(step);
         }
     }
diff --git a/launcher/minecraft/MinecraftInstance.h b/launcher/minecraft/MinecraftInstance.h
index fda58aa7..c66bf70d 100644
--- a/launcher/minecraft/MinecraftInstance.h
+++ b/launcher/minecraft/MinecraftInstance.h
@@ -4,7 +4,7 @@
 #include "minecraft/mod/Mod.h"
 #include <QProcess>
 #include <QDir>
-#include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/launch/QuickPlayTarget.h"
 
 class ModFolderModel;
 class WorldList;
@@ -78,11 +78,11 @@ public:
 
     //////  Launch stuff //////
     Task::Ptr createUpdateTask(Net::Mode mode) override;
-    shared_qobject_ptr<LaunchTask> createLaunchTask(AuthSessionPtr account, MinecraftServerTargetPtr serverToJoin) override;
+    shared_qobject_ptr<LaunchTask> createLaunchTask(AuthSessionPtr account, QuickPlayTargetPtr quickPlayTarget) override;
     QStringList extraArguments() const override;
-    QStringList verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin) override;
+    QStringList verboseDescription(AuthSessionPtr session, QuickPlayTargetPtr quickPlayTarget) override;
     QList<Mod> getJarMods() const;
-    QString createLaunchScript(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin);
+    QString createLaunchScript(AuthSessionPtr session, QuickPlayTargetPtr quickPlayTarget);
     /// get arguments passed to java
     QStringList javaArguments() const;
 
@@ -109,7 +109,7 @@ public:
     virtual QString getMainClass() const;
 
     // FIXME: remove
-    virtual QStringList processMinecraftArgs(AuthSessionPtr account, MinecraftServerTargetPtr serverToJoin) const;
+    virtual QStringList processMinecraftArgs(AuthSessionPtr account, QuickPlayTargetPtr quickPlayTarget) const;
 
     virtual JavaVersion getJavaVersion() const;
 
diff --git a/launcher/minecraft/launch/DirectJavaLaunch.cpp b/launcher/minecraft/launch/DirectJavaLaunch.cpp
index 2bcff664..7019fb46 100644
--- a/launcher/minecraft/launch/DirectJavaLaunch.cpp
+++ b/launcher/minecraft/launch/DirectJavaLaunch.cpp
@@ -55,7 +55,7 @@ void DirectJavaLaunch::executeTask()
     // make detachable - this will keep the process running even if the object is destroyed
     m_process.setDetachable(true);
 
-    auto mcArgs = minecraftInstance->processMinecraftArgs(m_session, m_serverToJoin);
+    auto mcArgs = minecraftInstance->processMinecraftArgs(m_session, m_quickPlayTarget);
     args.append(mcArgs);
 
     QString wrapperCommandStr = instance->getWrapperCommand().trimmed();
diff --git a/launcher/minecraft/launch/DirectJavaLaunch.h b/launcher/minecraft/launch/DirectJavaLaunch.h
index 58b119b8..5e27ed56 100644
--- a/launcher/minecraft/launch/DirectJavaLaunch.h
+++ b/launcher/minecraft/launch/DirectJavaLaunch.h
@@ -19,7 +19,7 @@
 #include <LoggedProcess.h>
 #include <minecraft/auth/AuthSession.h>
 
-#include "MinecraftServerTarget.h"
+#include "QuickPlayTarget.h"
 
 class DirectJavaLaunch: public LaunchStep
 {
@@ -41,9 +41,9 @@ public:
         m_session = session;
     }
 
-    void setServerToJoin(MinecraftServerTargetPtr serverToJoin)
+    void setQuickPlayTarget(QuickPlayTargetPtr quickPlayTarget)
     {
-        m_serverToJoin = std::move(serverToJoin);
+        m_quickPlayTarget = std::move(quickPlayTarget);
     }
 
 private slots:
@@ -53,6 +53,6 @@ private:
     LoggedProcess m_process;
     QString m_command;
     AuthSessionPtr m_session;
-    MinecraftServerTargetPtr m_serverToJoin;
+    QuickPlayTargetPtr m_quickPlayTarget;
 };
 
diff --git a/launcher/minecraft/launch/LauncherPartLaunch.cpp b/launcher/minecraft/launch/LauncherPartLaunch.cpp
index 8fd11eca..35d5c67e 100644
--- a/launcher/minecraft/launch/LauncherPartLaunch.cpp
+++ b/launcher/minecraft/launch/LauncherPartLaunch.cpp
@@ -60,7 +60,7 @@ void LauncherPartLaunch::executeTask()
     auto instance = m_parent->instance();
     std::shared_ptr<MinecraftInstance> minecraftInstance = std::dynamic_pointer_cast<MinecraftInstance>(instance);
 
-    m_launchScript = minecraftInstance->createLaunchScript(m_session, m_serverToJoin);
+    m_launchScript = minecraftInstance->createLaunchScript(m_session, m_quickPlayTarget);
     QStringList args = minecraftInstance->javaArguments();
     QString allArgs = args.join(", ");
     emit logLine("Java Arguments:\n[" + m_parent->censorPrivateInfo(allArgs) + "]\n\n", MessageLevel::Launcher);
diff --git a/launcher/minecraft/launch/LauncherPartLaunch.h b/launcher/minecraft/launch/LauncherPartLaunch.h
index 6a7ee0e5..19add61f 100644
--- a/launcher/minecraft/launch/LauncherPartLaunch.h
+++ b/launcher/minecraft/launch/LauncherPartLaunch.h
@@ -19,7 +19,7 @@
 #include <LoggedProcess.h>
 #include <minecraft/auth/AuthSession.h>
 
-#include "MinecraftServerTarget.h"
+#include "QuickPlayTarget.h"
 
 class LauncherPartLaunch: public LaunchStep
 {
@@ -41,9 +41,9 @@ public:
         m_session = session;
     }
 
-    void setServerToJoin(MinecraftServerTargetPtr serverToJoin)
+    void setQuickPlayTarget(QuickPlayTargetPtr quickPlayTarget)
     {
-        m_serverToJoin = std::move(serverToJoin);
+        m_quickPlayTarget = std::move(quickPlayTarget);
     }
 
 private slots:
@@ -54,7 +54,7 @@ private:
     QString m_command;
     AuthSessionPtr m_session;
     QString m_launchScript;
-    MinecraftServerTargetPtr m_serverToJoin;
+    QuickPlayTargetPtr m_quickPlayTarget;
 
     bool mayProceed = false;
 };
diff --git a/launcher/minecraft/launch/PrintInstanceInfo.cpp b/launcher/minecraft/launch/PrintInstanceInfo.cpp
index e8fbcb9b..5311fc08 100644
--- a/launcher/minecraft/launch/PrintInstanceInfo.cpp
+++ b/launcher/minecraft/launch/PrintInstanceInfo.cpp
@@ -142,6 +142,6 @@ void PrintInstanceInfo::executeTask()
 #endif
 
     logLines(log, MessageLevel::Launcher);
-    logLines(instance->verboseDescription(m_session, m_serverToJoin), MessageLevel::Launcher);
+    logLines(instance->verboseDescription(m_session, m_quickPlayTarget), MessageLevel::Launcher);
     emitSucceeded();
 }
diff --git a/launcher/minecraft/launch/PrintInstanceInfo.h b/launcher/minecraft/launch/PrintInstanceInfo.h
index fdc30f31..23d4c4a2 100644
--- a/launcher/minecraft/launch/PrintInstanceInfo.h
+++ b/launcher/minecraft/launch/PrintInstanceInfo.h
@@ -18,15 +18,15 @@
 #include <launch/LaunchStep.h>
 #include <memory>
 #include "minecraft/auth/AuthSession.h"
-#include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/launch/QuickPlayTarget.h"
 
 // FIXME: temporary wrapper for existing task.
 class PrintInstanceInfo: public LaunchStep
 {
     Q_OBJECT
 public:
-    explicit PrintInstanceInfo(LaunchTask *parent, AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin) :
-        LaunchStep(parent), m_session(session), m_serverToJoin(serverToJoin) {};
+    explicit PrintInstanceInfo(LaunchTask *parent, AuthSessionPtr session, QuickPlayTargetPtr quickPlayTarget) :
+        LaunchStep(parent), m_session(session), m_quickPlayTarget(quickPlayTarget) {};
     virtual ~PrintInstanceInfo(){};
 
     virtual void executeTask();
@@ -36,6 +36,6 @@ public:
     }
 private:
     AuthSessionPtr m_session;
-    MinecraftServerTargetPtr m_serverToJoin;
+    QuickPlayTargetPtr m_quickPlayTarget;
 };
 
diff --git a/launcher/minecraft/launch/MinecraftServerTarget.cpp b/launcher/minecraft/launch/QuickPlayTarget.cpp
similarity index 85%
rename from launcher/minecraft/launch/MinecraftServerTarget.cpp
rename to launcher/minecraft/launch/QuickPlayTarget.cpp
index 0f98f356..ac08afa3 100644
--- a/launcher/minecraft/launch/MinecraftServerTarget.cpp
+++ b/launcher/minecraft/launch/QuickPlayTarget.cpp
@@ -13,12 +13,12 @@
  * limitations under the License.
  */
 
-#include "MinecraftServerTarget.h"
+#include "QuickPlayTarget.h"
 
 #include <QStringList>
 
 // FIXME: the way this is written, it can't ever do any sort of validation and can accept total junk
-MinecraftServerTarget MinecraftServerTarget::parse(const QString &fullAddress) {
+QuickPlayTarget QuickPlayTarget::parseMultiplayer(const QString &fullAddress) {
     QStringList split = fullAddress.split(":");
 
     // The logic below replicates the exact logic minecraft uses for parsing server addresses.
@@ -63,5 +63,12 @@ MinecraftServerTarget MinecraftServerTarget::parse(const QString &fullAddress) {
         }
     }
 
-    return MinecraftServerTarget { realAddress, realPort };
+    return QuickPlayTarget {realAddress, realPort };
+}
+
+QuickPlayTarget QuickPlayTarget::parseSingleplayer(const QString &worldName)
+{
+    QuickPlayTarget target;
+    target.world = worldName;
+    return target;
 }
diff --git a/launcher/minecraft/launch/MinecraftServerTarget.h b/launcher/minecraft/launch/QuickPlayTarget.h
similarity index 70%
rename from launcher/minecraft/launch/MinecraftServerTarget.h
rename to launcher/minecraft/launch/QuickPlayTarget.h
index a402421a..f4a8dc82 100644
--- a/launcher/minecraft/launch/MinecraftServerTarget.h
+++ b/launcher/minecraft/launch/QuickPlayTarget.h
@@ -19,11 +19,16 @@
 
 #include <QString>
 
-struct MinecraftServerTarget {
+struct QuickPlayTarget {
+    // Multiplayer
     QString address;
     quint16 port;
 
-    static MinecraftServerTarget parse(const QString &fullAddress);
+    // Singleplayer
+    QString world;
+
+    static QuickPlayTarget parseMultiplayer(const QString &fullAddress);
+    static QuickPlayTarget parseSingleplayer(const QString &worldName);
 };
 
-typedef std::shared_ptr<MinecraftServerTarget> MinecraftServerTargetPtr;
+typedef std::shared_ptr<QuickPlayTarget> QuickPlayTargetPtr;
diff --git a/launcher/minecraft/legacy/LegacyInstance.cpp b/launcher/minecraft/legacy/LegacyInstance.cpp
index f467ec06..1849d315 100644
--- a/launcher/minecraft/legacy/LegacyInstance.cpp
+++ b/launcher/minecraft/legacy/LegacyInstance.cpp
@@ -225,7 +225,7 @@ QString LegacyInstance::getStatusbarDescription()
     return tr("Instance from previous versions.");
 }
 
-QStringList LegacyInstance::verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin)
+QStringList LegacyInstance::verboseDescription(AuthSessionPtr session, QuickPlayTargetPtr quickPlayTarget)
 {
     QStringList out;
 
diff --git a/launcher/minecraft/legacy/LegacyInstance.h b/launcher/minecraft/legacy/LegacyInstance.h
index 298543f7..7751ef97 100644
--- a/launcher/minecraft/legacy/LegacyInstance.h
+++ b/launcher/minecraft/legacy/LegacyInstance.h
@@ -112,7 +112,7 @@ public:
         return false;
     }
     shared_qobject_ptr<LaunchTask> createLaunchTask(
-            AuthSessionPtr account, MinecraftServerTargetPtr serverToJoin) override
+            AuthSessionPtr account, QuickPlayTargetPtr quickPlayTarget) override
     {
         return nullptr;
     }
@@ -126,7 +126,7 @@ public:
     }
 
     QString getStatusbarDescription() override;
-    QStringList verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin) override;
+    QStringList verboseDescription(AuthSessionPtr session, QuickPlayTargetPtr quickPlayTarget) override;
 
     QProcessEnvironment createEnvironment() override
     {
diff --git a/launcher/ui/pages/instance/InstanceSettingsPage.cpp b/launcher/ui/pages/instance/InstanceSettingsPage.cpp
index 397504fc..36e837d0 100644
--- a/launcher/ui/pages/instance/InstanceSettingsPage.cpp
+++ b/launcher/ui/pages/instance/InstanceSettingsPage.cpp
@@ -16,6 +16,10 @@
 #include "java/JavaInstallList.h"
 #include "FileSystem.h"
 
+#include "minecraft/MinecraftInstance.h"
+#include "minecraft/PackProfile.h"
+#include "minecraft/VersionFilterData.h"
+#include "minecraft/WorldList.h"
 
 InstanceSettingsPage::InstanceSettingsPage(BaseInstance *inst, QWidget *parent)
     : QWidget(parent), ui(new Ui::InstanceSettingsPage), m_instance(inst)
@@ -27,6 +31,23 @@ InstanceSettingsPage::InstanceSettingsPage(BaseInstance *inst, QWidget *parent)
     connect(ui->openGlobalJavaSettingsButton, &QCommandLinkButton::clicked, this, &InstanceSettingsPage::globalSettingsButtonClicked);
     connect(APPLICATION, &Application::globalSettingsAboutToOpen, this, &InstanceSettingsPage::applySettings);
     connect(APPLICATION, &Application::globalSettingsClosed, this, &InstanceSettingsPage::loadSettings);
+
+    auto *mcInst = dynamic_cast<MinecraftInstance *>(inst);
+    if (mcInst && mcInst->getPackProfile()->getComponent("net.minecraft")->getReleaseDateTime() >= g_VersionFilterData.quickPlayBeginsDate)
+    {
+        mcInst->worldList()->update();
+        for (const auto &world : mcInst->worldList()->allWorlds())
+        {
+            ui->worldsComboBox->addItem(world.folderName());
+        }
+    }
+    else
+    {
+        ui->worldRadioButton->setVisible(false);
+        ui->worldsComboBox->setVisible(false);
+        ui->serverAddressRadioButton->setChecked(true);
+    }
+
     loadSettings();
 }
 
@@ -195,8 +216,12 @@ void InstanceSettingsPage::applySettings()
     }
 
     // Join server on launch
-    bool joinServerOnLaunch = ui->serverJoinGroupBox->isChecked();
+    bool joinWorldOnLaunch = ui->quickPlayGroupBox->isChecked();
+    m_settings->set("JoinWorldOnLaunch", joinWorldOnLaunch);
+
+    bool joinServerOnLaunch = ui->serverAddressRadioButton->isChecked();
     m_settings->set("JoinServerOnLaunch", joinServerOnLaunch);
+
     if (joinServerOnLaunch)
     {
         m_settings->set("JoinServerOnLaunchAddress", ui->serverJoinAddress->text());
@@ -205,6 +230,18 @@ void InstanceSettingsPage::applySettings()
     {
         m_settings->reset("JoinServerOnLaunchAddress");
     }
+
+    bool joinSingleplayerWorldOnLaunch = ui->worldRadioButton->isChecked();
+    m_settings->set("JoinSingleplayerWorldOnLaunch", joinSingleplayerWorldOnLaunch);
+
+    if (joinSingleplayerWorldOnLaunch)
+    {
+        m_settings->set("JoinSingleplayerWorldOnLaunchName", ui->worldsComboBox->currentText());
+    }
+    else
+    {
+        m_settings->reset("JoinSingleplayerWorldOnLaunchName");
+    }
 }
 
 void InstanceSettingsPage::loadSettings()
@@ -272,8 +309,23 @@ void InstanceSettingsPage::loadSettings()
     ui->showGameTime->setChecked(m_settings->get("ShowGameTime").toBool());
     ui->recordGameTime->setChecked(m_settings->get("RecordGameTime").toBool());
 
-    ui->serverJoinGroupBox->setChecked(m_settings->get("JoinServerOnLaunch").toBool());
-    ui->serverJoinAddress->setText(m_settings->get("JoinServerOnLaunchAddress").toString());
+    if (!m_settings->contains("JoinWorldOnLaunch"))
+    {
+        ui->quickPlayGroupBox->setChecked(m_settings->get("JoinServerOnLaunch").toBool());
+        ui->serverAddressRadioButton->setChecked(m_settings->get("JoinServerOnLaunch").toBool());
+        ui->worldRadioButton->setChecked(false);
+    }
+    else
+    {
+        ui->quickPlayGroupBox->setChecked(m_settings->get("JoinWorldOnLaunch").toBool());
+        ui->serverAddressRadioButton->setChecked(m_settings->get("JoinServerOnLaunch").toBool());
+        ui->serverJoinAddress->setEnabled(m_settings->get("JoinServerOnLaunch").toBool());
+        ui->serverJoinAddress->setText(m_settings->get("JoinServerOnLaunchAddress").toString());
+        ui->worldRadioButton->setChecked(m_settings->get("JoinSingleplayerWorldOnLaunch").toBool());
+        ui->worldsComboBox->setEnabled(m_settings->get("JoinSingleplayerWorldOnLaunch").toBool());
+        ui->worldsComboBox->setCurrentText(m_settings->get("JoinSingleplayerWorldOnLaunchName").toString());
+    }
+
 }
 
 void InstanceSettingsPage::on_javaDetectBtn_clicked()
@@ -334,6 +386,16 @@ void InstanceSettingsPage::on_javaTestBtn_clicked()
     checker->run();
 }
 
+void InstanceSettingsPage::on_serverAddressRadioButton_toggled(bool checked)
+{
+    ui->serverJoinAddress->setEnabled(checked);
+}
+
+void InstanceSettingsPage::on_worldRadioButton_toggled(bool checked)
+{
+    ui->worldsComboBox->setEnabled(checked);
+}
+
 void InstanceSettingsPage::checkerFinished()
 {
     checker.reset();
diff --git a/launcher/ui/pages/instance/InstanceSettingsPage.h b/launcher/ui/pages/instance/InstanceSettingsPage.h
index 5c8c8e66..bb117def 100644
--- a/launcher/ui/pages/instance/InstanceSettingsPage.h
+++ b/launcher/ui/pages/instance/InstanceSettingsPage.h
@@ -22,6 +22,7 @@
 #include <QObjectPtr.h>
 #include "ui/pages/BasePage.h"
 #include "JavaCommon.h"
+#include "minecraft/WorldList.h"
 #include "Application.h"
 
 class JavaChecker;
@@ -60,6 +61,8 @@ private slots:
     void on_javaDetectBtn_clicked();
     void on_javaTestBtn_clicked();
     void on_javaBrowseBtn_clicked();
+    void on_serverAddressRadioButton_toggled(bool checked);
+    void on_worldRadioButton_toggled(bool checked);
 
     void applySettings();
     void loadSettings();
diff --git a/launcher/ui/pages/instance/InstanceSettingsPage.ui b/launcher/ui/pages/instance/InstanceSettingsPage.ui
index 729f8e2a..e8310d38 100644
--- a/launcher/ui/pages/instance/InstanceSettingsPage.ui
+++ b/launcher/ui/pages/instance/InstanceSettingsPage.ui
@@ -39,7 +39,7 @@
       <enum>QTabWidget::Rounded</enum>
      </property>
      <property name="currentIndex">
-      <number>0</number>
+      <number>4</number>
      </property>
      <widget class="QWidget" name="minecraftTab">
       <attribute name="title">
@@ -454,9 +454,9 @@
         </widget>
        </item>
        <item>
-        <widget class="QGroupBox" name="serverJoinGroupBox">
+        <widget class="QGroupBox" name="quickPlayGroupBox">
          <property name="title">
-          <string>Set a server to join on launch</string>
+          <string>Set a world to join on launch</string>
          </property>
          <property name="checkable">
           <bool>true</bool>
@@ -466,15 +466,9 @@
          </property>
          <layout class="QVBoxLayout" name="verticalLayout_11">
           <item>
-           <layout class="QGridLayout" name="serverJoinLayout">
+           <layout class="QGridLayout" name="quickPlayLayout">
             <item row="0" column="0">
-             <widget class="QLabel" name="serverJoinAddressLabel">
-              <property name="sizePolicy">
-               <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
-                <horstretch>0</horstretch>
-                <verstretch>0</verstretch>
-               </sizepolicy>
-              </property>
+             <widget class="QRadioButton" name="serverAddressRadioButton">
               <property name="text">
                <string>Server address:</string>
               </property>
@@ -483,6 +477,16 @@
             <item row="0" column="1">
              <widget class="QLineEdit" name="serverJoinAddress"/>
             </item>
+            <item row="1" column="0">
+             <widget class="QRadioButton" name="worldRadioButton">
+              <property name="text">
+               <string>Singleplayer world:</string>
+              </property>
+             </widget>
+            </item>
+            <item row="1" column="1">
+             <widget class="QComboBox" name="worldsComboBox"/>
+            </item>
            </layout>
           </item>
          </layout>
diff --git a/launcher/ui/pages/instance/ServersPage.cpp b/launcher/ui/pages/instance/ServersPage.cpp
index 8116d2bf..7cd39180 100644
--- a/launcher/ui/pages/instance/ServersPage.cpp
+++ b/launcher/ui/pages/instance/ServersPage.cpp
@@ -762,7 +762,8 @@ void ServersPage::on_actionMove_Down_triggered()
 void ServersPage::on_actionJoin_triggered()
 {
     const auto &address = m_model->at(currentServer)->m_address;
-    APPLICATION->launch(m_inst, true, nullptr, std::make_shared<MinecraftServerTarget>(MinecraftServerTarget::parse(address)));
+    APPLICATION->launch(m_inst, true, nullptr, std::make_shared<QuickPlayTarget>(
+            QuickPlayTarget::parseMultiplayer(address)));
 }
 
 #include "ServersPage.moc"
diff --git a/launcher/ui/pages/instance/WorldListPage.cpp b/launcher/ui/pages/instance/WorldListPage.cpp
index d2bf63bd..908b464d 100644
--- a/launcher/ui/pages/instance/WorldListPage.cpp
+++ b/launcher/ui/pages/instance/WorldListPage.cpp
@@ -24,7 +24,6 @@
 #include <QMessageBox>
 #include <QTreeView>
 #include <QInputDialog>
-#include <QProcess>
 
 #include "tools/MCEditTool.h"
 #include "FileSystem.h"
@@ -32,6 +31,9 @@
 #include "ui/GuiUtil.h"
 #include "DesktopServices.h"
 
+#include "minecraft/PackProfile.h"
+#include "minecraft/VersionFilterData.h"
+
 #include "Application.h"
 
 
@@ -62,7 +64,7 @@ public:
 };
 
 
-WorldListPage::WorldListPage(BaseInstance *inst, std::shared_ptr<WorldList> worlds, QWidget *parent)
+WorldListPage::WorldListPage(InstancePtr inst, std::shared_ptr<WorldList> worlds, QWidget *parent)
     : QMainWindow(parent), m_inst(inst), ui(new Ui::WorldListPage), m_worlds(worlds)
 {
     ui->setupUi(this);
@@ -311,8 +313,15 @@ void WorldListPage::mceditState(LoggedProcess::State state)
 
 void WorldListPage::worldChanged(const QModelIndex &current, const QModelIndex &previous)
 {
+    auto mcInst = std::dynamic_pointer_cast<MinecraftInstance>(m_inst);
+    bool enableJoinActions = mcInst && mcInst->getPackProfile()->getComponent("net.minecraft")->getReleaseDateTime() >= g_VersionFilterData.quickPlayBeginsDate;
+
     QModelIndex index = getSelectedWorld();
     bool enable = index.isValid();
+    // FIXME: Hide the join buttons if the Minecraft version is too old instead of just disabling them.
+    // ui->actionJoin->setVisible(false) had no effect for some reason, at least on my machine -arthomnix
+    ui->actionJoin->setEnabled(enable && enableJoinActions);
+    ui->actionJoinOffline->setEnabled(enable && enableJoinActions);
     ui->actionCopy_Seed->setEnabled(enable);
     ui->actionMCEdit->setEnabled(enable);
     ui->actionRemove->setEnabled(enable);
@@ -409,4 +418,29 @@ void WorldListPage::on_actionRefresh_triggered()
     m_worlds->update();
 }
 
+void WorldListPage::joinSelectedWorld(bool online)
+{
+    auto index = getSelectedWorld();
+    if (!index.isValid())
+    {
+        return;
+    }
+
+    auto worldVariant = m_worlds->data(index, WorldList::ObjectRole);
+    auto world = (World *) worldVariant.value<void *>();
+    auto name = world->folderName();
+
+    APPLICATION->launch(m_inst, online, nullptr, std::make_shared<QuickPlayTarget>(QuickPlayTarget::parseSingleplayer(name)));
+}
+
+void WorldListPage::on_actionJoin_triggered()
+{
+    joinSelectedWorld(true);
+}
+
+void WorldListPage::on_actionJoinOffline_triggered()
+{
+    joinSelectedWorld(false);
+}
+
 #include "WorldListPage.moc"
diff --git a/launcher/ui/pages/instance/WorldListPage.h b/launcher/ui/pages/instance/WorldListPage.h
index e07d5794..ceb6df98 100644
--- a/launcher/ui/pages/instance/WorldListPage.h
+++ b/launcher/ui/pages/instance/WorldListPage.h
@@ -34,7 +34,7 @@ class WorldListPage : public QMainWindow, public BasePage
 
 public:
     explicit WorldListPage(
-        BaseInstance *inst,
+        InstancePtr inst,
         std::shared_ptr<WorldList> worlds,
         QWidget *parent = 0
     );
@@ -67,13 +67,14 @@ protected:
     QMenu * createPopupMenu() override;
 
 protected:
-    BaseInstance *m_inst;
+    InstancePtr m_inst;
 
 private:
     QModelIndex getSelectedWorld();
     bool isWorldSafe(QModelIndex index);
     bool worldSafetyNagQuestion();
     void mceditError();
+    void joinSelectedWorld(bool online);
 
 private:
     Ui::WorldListPage *ui;
@@ -92,6 +93,8 @@ private slots:
     void on_actionView_Folder_triggered();
     void on_actionDatapacks_triggered();
     void on_actionReset_Icon_triggered();
+    void on_actionJoin_triggered();
+    void on_actionJoinOffline_triggered();
     void worldChanged(const QModelIndex &current, const QModelIndex &previous);
     void mceditState(LoggedProcess::State state);
 
diff --git a/launcher/ui/pages/instance/WorldListPage.ui b/launcher/ui/pages/instance/WorldListPage.ui
index 7c68bfae..074f88fc 100644
--- a/launcher/ui/pages/instance/WorldListPage.ui
+++ b/launcher/ui/pages/instance/WorldListPage.ui
@@ -81,6 +81,9 @@
    </attribute>
    <addaction name="actionAdd"/>
    <addaction name="separator"/>
+   <addaction name="actionJoin" />
+   <addaction name="actionJoinOffline" />
+   <addaction name="separator" />
    <addaction name="actionRename"/>
    <addaction name="actionCopy"/>
    <addaction name="actionRemove"/>
@@ -97,6 +100,22 @@
     <string>Add</string>
    </property>
   </action>
+  <action name="actionJoin">
+   <property name="text">
+    <string>Join</string>
+   </property>
+   <property name="toolTip">
+    <string>Launch the instance directly into the selected world</string>
+   </property>
+  </action>
+  <action name="actionJoinOffline">
+   <property name="text">
+    <string>Join offline</string>
+   </property>
+   <property name="toolTip">
+    <string>Launch the instance in offline mode directly into the selected world</string>
+   </property>
+  </action>
   <action name="actionRename">
    <property name="text">
     <string>Rename</string>
diff --git a/libraries/launcher/org/multimc/onesix/OneSixLauncher.java b/libraries/launcher/org/multimc/onesix/OneSixLauncher.java
index f57ad636..edf1c9b2 100644
--- a/libraries/launcher/org/multimc/onesix/OneSixLauncher.java
+++ b/libraries/launcher/org/multimc/onesix/OneSixLauncher.java
@@ -55,6 +55,8 @@ public class OneSixLauncher implements Launcher
     private String serverPort;
     private boolean useQuickPlay;
 
+    private String joinWorld;
+
     // the much abused system classloader, for convenience (for further abuse)
     private ClassLoader cl;
 
@@ -82,6 +84,7 @@ public class OneSixLauncher implements Launcher
         serverAddress = params.firstSafe("serverAddress", null);
         serverPort = params.firstSafe("serverPort", null);
         useQuickPlay = params.firstSafe("useQuickPlay").startsWith("1");
+        joinWorld = params.firstSafe("joinWorld", null);
 
         cwd = System.getProperty("user.dir");
 
@@ -185,6 +188,12 @@ public class OneSixLauncher implements Launcher
             mcparams.add(Integer.toString(winSizeH));
         }
 
+        if (joinWorld != null)
+        {
+            mcparams.add("--quickPlaySingleplayer");
+            mcparams.add(joinWorld);
+        }
+
         if (serverAddress != null)
         {
             if (useQuickPlay)