This is a PC Clone of the "very well known" NES/SNES game Super Mario Brothers. The Ctrl key is used to make Mario walk faster, and the Alt key is used to jump. Mario seems really small compared to the obstacles that get in his way, so I suppose you could almost say it's a little bit like the stage in Mario 3 when he's in Giant Land, in World 4.1 I think it is :) If you're looking for something to fill in about 5 minutes or so, then try out this game. Its a great side scroller, and a nice clone of the console versions.