diff --git a/core/assets-raw/sprites/blocks/distribution/mass-driver.png b/core/assets-raw/sprites/blocks/distribution/mass-driver.png
index 79f79274b4..cde1d754f9 100644
Binary files a/core/assets-raw/sprites/blocks/distribution/mass-driver.png and b/core/assets-raw/sprites/blocks/distribution/mass-driver.png differ
diff --git a/core/assets-raw/sprites/blocks/extra/shadow-round-3.png b/core/assets-raw/sprites/blocks/extra/shadow-round-3.png
index 639b3f0e12..f2b116ff67 100644
Binary files a/core/assets-raw/sprites/blocks/extra/shadow-round-3.png and b/core/assets-raw/sprites/blocks/extra/shadow-round-3.png differ
diff --git a/core/assets/bundles/bundle.properties b/core/assets/bundles/bundle.properties
index 9fbf4323df..e86a6f86fc 100644
--- a/core/assets/bundles/bundle.properties
+++ b/core/assets/bundles/bundle.properties
@@ -370,6 +370,7 @@ 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.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 6bb4269a96..33c8a4ae0d 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 50965884f8..6111ed6fc4 100644
--- a/core/src/io/anuke/mindustry/core/Control.java
+++ b/core/src/io/anuke/mindustry/core/Control.java
@@ -13,6 +13,7 @@ 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;
@@ -109,6 +110,12 @@ 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);
+                Settings.save();
+            }
         });
 
         Events.on(WorldLoadGraphicsEvent.class, () -> {
diff --git a/core/src/io/anuke/mindustry/core/Logic.java b/core/src/io/anuke/mindustry/core/Logic.java
index 9f9af7e9bb..c83d751015 100644
--- a/core/src/io/anuke/mindustry/core/Logic.java
+++ b/core/src/io/anuke/mindustry/core/Logic.java
@@ -59,7 +59,7 @@ public class Logic extends Module{
                             tile.entity.items.set(item, 1000);
                         }
                     }
-                }else{
+                }else if(!state.mode.infiniteResources){
                     tile.entity.items.add(Items.tungsten, 50);
                     tile.entity.items.add(Items.lead, 20);
                 }
diff --git a/core/src/io/anuke/mindustry/ui/fragments/BlocksFragment.java b/core/src/io/anuke/mindustry/ui/fragments/BlocksFragment.java
index 5e1a5c9884..79e18ea09e 100644
--- a/core/src/io/anuke/mindustry/ui/fragments/BlocksFragment.java
+++ b/core/src/io/anuke/mindustry/ui/fragments/BlocksFragment.java
@@ -227,10 +227,12 @@ public class BlocksFragment extends Fragment{
 
                     if(entity == null) return;
 
-                    for(ItemStack s : r.requirements){
-                        if(!entity.items.has(s.item, Mathf.ceil(s.amount))){
-                            istack.setColor(Color.GRAY);
-                            return;
+                    if(!state.mode.infiniteResources){
+                        for(ItemStack s : r.requirements){
+                            if(!entity.items.has(s.item, Mathf.ceil(s.amount))){
+                                istack.setColor(Color.GRAY);
+                                return;
+                            }
                         }
                     }
                     istack.setColor(Color.WHITE);
@@ -310,7 +312,7 @@ public class BlocksFragment extends Fragment{
             requirements.addImage(stack.item.region).size(8 * 3);
             Label reqlabel = new Label(() -> {
                 TileEntity core = players[0].getClosestCore();
-                if(core == null) return "*/*";
+                if(core == null || state.mode.infiniteResources) return "*/*";
 
                 int amount = core.items.get(stack.item);
                 String color = (amount < stack.amount / 2f ? "[red]" : amount < stack.amount ? "[orange]" : "[white]");
diff --git a/core/src/io/anuke/mindustry/world/blocks/BuildBlock.java b/core/src/io/anuke/mindustry/world/blocks/BuildBlock.java
index a5f9251869..c110d9dbeb 100644
--- a/core/src/io/anuke/mindustry/world/blocks/BuildBlock.java
+++ b/core/src/io/anuke/mindustry/world/blocks/BuildBlock.java
@@ -208,7 +208,7 @@ public class BuildBlock extends Block{
                 builderID = builder.getID();
             }
             
-            if(progress >= 1f || debug){
+            if(progress >= 1f || debug || state.mode.infiniteResources){
                 Call.onConstructFinish(tile, recipe.result, builderID, tile.getRotation(), builder.getTeam());
             }
         }
@@ -236,7 +236,7 @@ public class BuildBlock extends Block{
 
             progress = Mathf.clamp(progress - amount);
 
-            if(progress <= 0 || debug){
+            if(progress <= 0 || debug || state.mode.infiniteResources){
                 Call.onDeconstructFinish(tile, this.recipe == null ? previous : this.recipe.result);
             }
         }