Sisyphus goes up: You're going down is a very challenging platformer. 

Play as Sisyphus as you carry a  small-medium-sized boulder out of the underworld as you navigate some of the evilest and most difficult obstacle courses ever devised.

You can now get destroyed by this game in the browser, have fun.

But seriously, no one I know is good enough to beat it.  I've beaten every part of it at least once but not all at once and not in one sitting. The game is beatable but are you good enough to do it?  post your evidence in the comments and I'll make more levels.