Think you're good at games? Go play I Wanna Be The Guy. It will seriously kill your sanity.

Want 15 easy Achievement points? Here's a quick guide to getting "Assault Trooper". Load up Call of Duty 3 and play The Island (mission 2) on Easy. Use only the BAR sparingly in 1 and 2 shot bursts, and melee and use grenades as often as possible. Let your squadmates deal with the spray-and-pray. If you only use the BAR, and finish the mission, you'll get it. Enjoy your Achievement!

So I'm browsing on the net and I come across a little freeware gem. It's called Counter-Strike 2D, and instead of a first person view, you play from a top-down perspective, like the original Grand Theft Auto. You can play on the net, or with bots that have 4 different difficulties. There is a fog of war that can be turned off. All of the CS maps are faithfully recreated using tiles. You can get it at http://www.cs2d.com/download.php.