Day of Defat is a great world war game. Tons of great gameplay. Very good FPS game, made on a source engine.

Portal 2 is like a post apocalyptic version of Portal 1, and it also features CO-OP. So it is a CO-OP brain puzzle, where you need to use your brain.

Portal 1 is a very good brain puzzle game. You need to use your mind to get through the levels. But be aware.... The cake is a lie.....

In PD2 you take control of criminal heisters, you can stealthly rob banks, or just go loud and rob banks with heavy armour and machine guns. Great COOP.

"After Team Fortress 2 became free, it became even more popular. Which makes sense with its tons of good gameplay, fun and great graphics."

"Counter-Strike: Source (Known as CSS) is from the Counter-Strike series. Css is a good and well played game. A very good FPS game, with great gameplay.

Counter-Strike: Global Offensive (Known as CSGO) is from the CS- Series. CSGO is a good game with great graphics and a good gameplay. Very good FPS game

Counter-Strike: Condition Zero (Known as CSCZ) is from the Counter-Strike Series. A very good game for its price. Great gameplay from a old FPS game.

Counter-Strike (Also known as CS 1.6) is the first game in the Counter-Strike series. It is a great game with a low price. A very good FPS game.