Canabalt is an excellent side-scrolling flash game! It is very simple and very addicting. All you have to do is jump and avoid boxes, chairs, trash, crumbling buildings, falling debri, birds and glass windows. 🙂
If you start running a little too fast, just hit a box to trip and slow the tempo back down a bit. Too much fun! Enjoy!
Canabalt was created by Adam Atomic and Danny Baranowsky