diff --git a/app/lib/world/world.coffee b/app/lib/world/world.coffee
index 6d55c211b..a6ba95418 100644
--- a/app/lib/world/world.coffee
+++ b/app/lib/world/world.coffee
@@ -245,11 +245,17 @@ module.exports = class World
   addScripts: (scripts...) ->
     @scripts = (@scripts ? []).concat scripts
 
+  addTrackedProperties: (props...) ->
+    @trackedProperties = (@trackedProperties ? []).concat props
+
   serialize: ->
     # Code hotspot; optimize it
     if @frames.length < @totalFrames then worldShouldBeOverBeforeSerialization
     [transferableObjects, nontransferableObjects] = [0, 0]
-    o = {name: @name, totalFrames: @totalFrames, maxTotalFrames: @maxTotalFrames, frameRate: @frameRate, dt: @dt, victory: @victory, userCodeMap: {}, showCoordinates: @showCoordinates, showGrid: @showGrid, showPaths: @showPaths, indieSprites: @indieSprites}
+    o = {name: @name, totalFrames: @totalFrames, maxTotalFrames: @maxTotalFrames, frameRate: @frameRate, dt: @dt, victory: @victory, userCodeMap: {}}
+
+    o[prop] = @[prop] for prop in @trackedProperties or []
+    
     for thangID, methods of @userCodeMap
       serializedMethods = o.userCodeMap[thangID] = {}
       for methodName, method of methods