diff --git a/core/assets-raw/sprites/blocks/defense/force-projector.png b/core/assets-raw/sprites/blocks/defense/force-projector.png
index c96afb4bf0..9c54cfe032 100644
Binary files a/core/assets-raw/sprites/blocks/defense/force-projector.png and b/core/assets-raw/sprites/blocks/defense/force-projector.png differ
diff --git a/core/assets/bundles/bundle.properties b/core/assets/bundles/bundle.properties
index 7f15ab9c5c..447bdb7cf3 100644
--- a/core/assets/bundles/bundle.properties
+++ b/core/assets/bundles/bundle.properties
@@ -398,7 +398,7 @@ mode.waves.name=waves
 mode.waves.description=the normal mode. limited resources and automatic incoming waves.
 mode.sandbox.name=sandbox
 mode.sandbox.description=infinite resources and no timer for waves.
-mode.sandbox.warning=Note that blocks cannot be used in sandbox mode until they are unlocked in other modes.\n\n[LIGHT_GRAY]If you have not unlocked any blocks, none will appear.
+mode.custom.warning=Note that blocks cannot be used in custom games until they are unlocked in sectors.\n\n[LIGHT_GRAY]If you have not unlocked any blocks, none will appear.
 mode.freebuild.name=freebuild
 mode.freebuild.description=limited resources and no timer for waves.
 
diff --git a/core/assets/sprites/sprites.png b/core/assets/sprites/sprites.png
index 348450d73e..b7842152d3 100644
Binary files a/core/assets/sprites/sprites.png and b/core/assets/sprites/sprites.png differ
diff --git a/core/src/io/anuke/mindustry/core/Control.java b/core/src/io/anuke/mindustry/core/Control.java
index cebfe70bf9..11207f1193 100644
--- a/core/src/io/anuke/mindustry/core/Control.java
+++ b/core/src/io/anuke/mindustry/core/Control.java
@@ -13,7 +13,6 @@ import io.anuke.mindustry.entities.TileEntity;
 import io.anuke.mindustry.game.Content;
 import io.anuke.mindustry.game.ContentDatabase;
 import io.anuke.mindustry.game.EventType.*;
-import io.anuke.mindustry.game.GameMode;
 import io.anuke.mindustry.game.Saves;
 import io.anuke.mindustry.input.DefaultKeybinds;
 import io.anuke.mindustry.input.DesktopInput;
@@ -110,9 +109,9 @@ public class Control extends Module{
 
             state.set(State.playing);
 
-            if(state.mode == GameMode.sandbox && !Settings.getBool("sandbox-warning", false)){
-                threads.runGraphics(() -> ui.showInfo("$mode.sandbox.warning"));
-                Settings.putBool("sandbox-warning", true);
+            if(world.getSector() == null && !Settings.getBool("custom-warning", false)){
+                threads.runGraphics(() -> ui.showInfo("$mode.custom.warning"));
+                Settings.putBool("custom-warning", true);
                 Settings.save();
             }
         });
@@ -388,7 +387,7 @@ public class Control extends Module{
             }
 
             //check unlocks every 2 seconds
-            if(!state.mode.infiniteResources && Timers.get("timerCheckUnlock", 120)){
+            if(world.getSector() != null && Timers.get("timerCheckUnlock", 120)){
                 checkUnlockableBlocks();
 
                 //save if the db changed