It’s not hard to find free games on the Internet — but it’s damn near impossible to sift through the terabytes of crap to find good ones. That’s where the editors of Games for Windows: The Official Magazine come in: We’ve tracked down another 101 absolutely, positively, no-strings-attached free games that are actually worth playing, grouped them into handy categories, and put most of ‘em up on FileFront.com. There’s something here for everyone, from RPGs to real-time strategy to Asteroids Flash games, though we have to confess up front: There are actually more than 101 free games here. So no complaining that you’re not getting your money’s worth. CHECK IT OUT

BlitzGamer.com is the leading Free Flash and ShockWave Gaming Arcade site! They encourage you to Register for Free and take advantage of chatting with your friends, sending messages, rating games, reviewing games, and adding games to your favorite list. Please make sure that your browser has Flash Player and Shockwave in order to play the free games. They will be adding at least 1 game a day so make sure to check out there new section to see all of the latest and greatest Free Flash and Shockwave Games! Enjoy! CHECK IT OUT

allgamesallfree.com. Here they provide excellent free games made by various game designers across the web who have given them permission to host their games. Currently, they have 280+ games and yes , thanks to there sponsors you can play all the games absolutely! FREE CHECK IT OUT

Play Half Life Quake 3 Doom and many more all in your browser with shockwave 3d CHECK IT OUT 

Undoubtedly the greatest Mario game to ever hit the flash platform. The game uses the graphics from Super Mario World made for the Super Nintendo console but have loads of new levels.
It’s a bit easier than the original but just as fun and with a big touch of nostalgia. CHECK IT OUT