diff --git a/src/screens/gm/gameMasterScreen.cpp b/src/screens/gm/gameMasterScreen.cpp
index 889d2768f5..8a7e11a5b0 100644
--- a/src/screens/gm/gameMasterScreen.cpp
+++ b/src/screens/gm/gameMasterScreen.cpp
@@ -174,18 +174,35 @@ GameMasterScreen::GameMasterScreen(RenderLayer* render_layer)
     box_selection_overlay->layout.fill_width = false;
     box_selection_overlay->hide();
 
-    pause_button = new GuiToggleButton(this, "PAUSE_BUTTON", tr("button", "Pause"), [](bool value) {
-        if (!value)
+    pause_button = new GuiToggleButton(this, "PAUSE_BUTTON", tr("button", "Pause"), [this](bool value) {
+        if (!value) {
             engine->setGameSpeed(1.0f);
+            slow_button->setValue(false);
+        }
         else
+        {
             engine->setGameSpeed(0.0f);
+            slow_button->setValue(false);
+        }
     });
     pause_button->setValue(engine->getGameSpeed() == 0.0f)->setPosition(20, 20, sp::Alignment::TopLeft)->setSize(250, 50);
+    slow_button = new GuiToggleButton(this, "SLOW_BUTTON", tr("button", "Slow"), [this](bool value) {
+        if (!value) {
+            engine->setGameSpeed(1.0f);
+            pause_button->setValue(false);
+        }
+        else
+        {
+            engine->setGameSpeed(0.1f);
+            pause_button->setValue(false);
+        }
+    });
+    slow_button->setValue(false)->setPosition(300, 20, sp::Alignment::TopLeft)->setSize(250, 50);
 
     intercept_comms_button = new GuiToggleButton(this, "INTERCEPT_COMMS_BUTTON", tr("button", "Intercept all comms"), [](bool value) {
         gameGlobalInfo->intercept_all_comms_to_gm = value;
     });
-    intercept_comms_button->setValue(gameGlobalInfo->intercept_all_comms_to_gm)->setTextSize(20)->setPosition(300, 20, sp::Alignment::TopLeft)->setSize(200, 25);
+    intercept_comms_button->setValue(gameGlobalInfo->intercept_all_comms_to_gm)->setTextSize(20)->setPosition(580, 20, sp::Alignment::TopLeft)->setSize(200, 25);
 
     faction_selector = new GuiSelector(this, "FACTION_SELECTOR", [this](int index, string value) {
         for (auto obj : targets.getTargets())
@@ -478,6 +495,10 @@ void GameMasterScreen::update(float delta)
     // Track selection indices to determine "*mixed*" state.
     std::unordered_map<string, size_t> selection_info_index;
 
+    // Update pause button
+    slow_button->setValue(engine->getGameSpeed() == 0.1f);
+    pause_button->setValue(engine->getGameSpeed() == 0.0f);
+
     // List position if only one entity is selected.
     if (targets.getTargets().size() == 1)
     {
diff --git a/src/screens/gm/gameMasterScreen.h b/src/screens/gm/gameMasterScreen.h
index d2da1f1ab8..998e82e667 100644
--- a/src/screens/gm/gameMasterScreen.h
+++ b/src/screens/gm/gameMasterScreen.h
@@ -53,6 +53,7 @@ class GameMasterScreen : public GuiCanvas, public Updatable
     GuiButton* player_comms_hail;
     GuiButton* global_message_button;
     GuiToggleButton* pause_button;
+    GuiToggleButton* slow_button;
     GuiToggleButton* intercept_comms_button;
     GuiButton* tweak_button;
     GuiRadarZoomSlider* zoom_slider;
diff --git a/src/script.cpp b/src/script.cpp
index 67b8a6fa60..e062a30a53 100644
--- a/src/script.cpp
+++ b/src/script.cpp
@@ -702,6 +702,21 @@ static bool luaIsGamePaused()
     return engine->getGameSpeed() == 0.0f;
 }
 
+static void luaSlowGame()
+{
+    engine->setGameSpeed(0.1f);
+}
+
+static void luaUnslowGame()
+{
+    engine->setGameSpeed(1.0f);
+}
+
+static bool luaIsGameSlowed()
+{
+    return engine->getGameSpeed() == 0.1f;
+}
+
 static void luaPlaySoundFile(string filename)
 {
     int n = filename.rfind(".");
@@ -1405,6 +1420,18 @@ bool setupScriptEnvironment(sp::script::Environment& env)
     /// Returns true if the game is paused.
     /// Example: local is_paused = isGamePaused()
     env.setGlobal("isGamePaused", &luaIsGamePaused);
+    /// void slowGame()
+    /// Slows down the game to 10% game speed.
+    /// Example: slowGame()
+    env.setGlobal("slowGame", &luaSlowGame);
+    /// void unslowGame()
+    /// Restores the normal game speed.
+    /// Example: unslowGame()
+    env.setGlobal("unslowGame", &luaUnslowGame);
+    /// bool isGameSlowed()
+    /// Returns true if the game was slowed down by slowGame.
+    /// Example: local is_slowed = isGameSlowed()
+    env.setGlobal("isGameSlowed", &luaIsGameSlowed);
     /// void playSoundFile(string filename)
     /// Plays the given audio file on the server.
     /// Paths are relative to the resources/ directory.