Anybody know of any challenging puzzle games to play online?

[spider_sense]

I'm looking for good puzzle games of any caliber as long as it's not crappy I'm down to play it. Flashes are greatly appreciated btw, so everyone post up and show me puzzles games! <_<

 

[Beat!]

http://levelgame.net/

Good luck.

 

[Lore]

Wrong board, mate. Try the light house.