#30 - Left 4 Dead 2 (PC)
As guessed by Miz. L4D2 was a really nice surprise for me & my friend after we were looking for a new Steam co-op game after growing tired of TF2. The replayability of the game is insane between the increasing difficulty of the campaign modes & the competitive multiplayer, the basic premise of the game is extremely solid and the fact that the game attempts to tell quite an interesting character-centric zombie story while still keeping things light hearted is a big triumph. Plus, there are some awesome set pieces (Hard Rain is one of the best levels ever) and - this is just a small personal point - but the game runs so much better on my laptop than L4D1 for some reason.
Clue for my #29 - 5th in an RPG series which mixes the old with the new to become a brilliant swansong for the franchise and for the PS2.
