Click the squares to make those squares stand out, it stands out by turning red. Click a red square again to make it grey! Press the reset button to make all squares grey without you having to click all squares 1 by 1. Every time you press green flag all the squares will automaticly reset.
If it takes a while to load thats because it has: -53 Spirits -118 Costumes -825 Code Blocks Like and fav please, it would help a lot!