Remix and read the comments in the first sprite ("README") (You are limited to submitting 3 characters per person) If you'd like, you can add your own Easter egg (just create a new sprite called "easter egg") and create a comment explaining how to get it and what it does. This is not required and frankly, there is a good chance that it won't even get added into the game because if I have all 70 submissions asking for an Easter egg, it would be pointless to add every single one of them.