Paper Moon
I like that you have to change the environment.
Music Catch 2
Mesmerizing.
rlax
Yet another addictive flash game.
Reactions
How fast are yours?
Fantastic Contraption
Like Crazy Machines on OS X. Check out the forums for some insane setups.
Doeo
Yet another addictive flash game.
Boombot
I tried not to get hooked, but I did.
BoomsticK
Really simple flash game. And terribly addictive.
Spin The Black Circle
Simple, addictive flash game of gravity and spinning. You might lose many hours to this.
Shuffle
Super addictive flash game. I got 42,300.