Wow! -My quickest project ever! (Must've been <10mins...) Just a little something as a response to this post: https://scratch.mit.edu/discuss/post/1168238/ Note this project doesn't actually do anything... :) Having a "previous costume" block has been suggested loads of times in the forums, and it obviously has a really easy workaround. ( E.g. see https://scratch.mit.edu/discuss/topic/117614/ ) Also, having "previous/next costume" as items in the drop-down menu for the switch costume block has been suggested numerous times as a possibility, including in the same thread as above. But Scratch actually already recognises these strings in that block, so it's just a case of making them appear in there... :)