Use the arrow keys to move around, and try to find the three* scratch cat heads in the stage. *the third one exploited wonky physics in 2.0, so you'll have to go inside the project to get in in 3.0
Credit to Nintendo for the music in the boss fight. This isn't really a game, more a proof of concept thing to prove that I can do this. If you want, remix this to make your own scrolling game. This is in no way perfect. It's very possible to break the system, but most of the time pressing the green flag again will fix it.