Arrow keys to move. Red circles are coins (worth one point each). Dark blue saps your health (you die at 0 health). Yellow circles are save points. Green kills you instantly. Dying loses you a point each time. Light blue drifts you left, and pale orange drifts you right. Powerups (double jump, key) are orange too. The goal is purple. If you get to the goal after having died only once (it's impossible not to die at least once), you get 5 bonus points. Maximum possible score 30. Scroll down, there's more. There are a few glitches; if you get stuck and you can't move, press "d" to commit suicide. Be warned, the last three screens are very hard; I haven't yet managed a positive score because of that. (EDIT: New high score: 15) Also, beware of invisible obstacles.
Most platformers that I've seen on this site have a story behind them. This one doesn't. This is just a weird colored ball rolling and jumping over colored obstacles. Enough said. UPDATE 1-17-2020: Fixed issues with newer version of Scratch with level changes not working, moving obstacles getting stuck