Code of Everand is a great free online MMO that you don't have to download anything for and it looks great too!
Free realms. Is very fun and it's free
SIMS 3 Is the best.
Bewilder-II Animals jigsaw puzzle game is a good free iphone game.
In my opinion, the best multiplayer game is called: Lightbike 2 (free game)
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the best game ever, GTA
According to Tech Radar the best free online game to play is Planetside 2. The game is completely free, but there are in game micro purchases available.
Crash Bandicoot
armorgames.com
castle crashers
wesnoth
Wedoodle by far