Counter Strike: Source

I recently picked up a VALVE/STEAM account and got Counter Strike: Source. When I picked up this game, I found out that it was purely multiplayer (meaning, there is no single player, it's purely online). This was exciting. As soon as I joined a server, I had to choose a weapon and just like that, the game started and I was playing. The game is very simple, and easy to play. You have to use the mouse to move around and aim, and you shoot using the clicker. You also the WASD keys to move. For only $20, the game is definently has solid online gameplay. The only downside is that it may get a bit repetitive, because there are only like 5 levels. However, there are different mods for the game so the choices are endless. I would highly recommend this game to anyone!