^ the title. I think I like Exit Path best.

This is hard since I've played many Flash games, but I guess I'll say Punk-O-Matic 2. Being able to write the music rather than playing music that's already in the game makes it really replayable.
I changed my mind, it's QWOP thighs and calves down. :3

QWOP, hands down.

I loved Go to Hell.It was weird and addicting at the same time.