I've enjoyed some of the silly .gifs, how about some interesting Flash games?

Not like I actually need more time-wasters, but maybe there are better ones? There must be a whole lot of better stuff out there than Penguin Baseball and Catapult - I searched but was surprised to find no SB thread of these.

Here are a few assorted ones to get started -

This one's my current personal fave, can be a brainbuster ...
http://www.gamebalance.com/games/orbox.html

http://onemorelevel.com/game/spin_the_black_circle
(I just found this one, I'm now only up to the first 'electrified fence.')

http://www.yarukinoki.net/flash/pendulumeca/
http://www.x-woods.com/games/differences/loader.swf
http://grant.robinson.name/projects/guess-the-google/guess-the-google.swf

Not really a game, but fascinating
http://www.squidsoup.org/doodle/

Played this today, thought it was fun:
http://www.kongregate.com/games/Ivory/6-differences

My neighbor on campus got me into this game the other night..
http://www.ebaumsworld.com/games/play/816/