diff --git a/app/views/play/level/PlayLevelView.coffee b/app/views/play/level/PlayLevelView.coffee
index 4dd490fe7..6f2f49a8d 100644
--- a/app/views/play/level/PlayLevelView.coffee
+++ b/app/views/play/level/PlayLevelView.coffee
@@ -424,7 +424,7 @@ module.exports = class PlayLevelView extends RootView
     @simulator.fetchAndSimulateOneGame()
 
   shouldSimulate: ->
-    return false  # Performance is too bad right now, gotta fix it first.
+    return @getQueryVariable('simulate') is true  # Performance is too bad right now, gotta fix it first.
     # Crude heuristics are crude.
     defaultCores = 2
     cores = window.navigator.hardwareConcurrency or defaultCores  # Available on Chrome/Opera, soon Safari