Left 4 Dead
Originally released on the 17th of november, 2008, is Valve's first co-op zombie game. Originally developed by Turtle Rock Studios.
Now you may ask, "Why would I want to buy this game when it's ported in Left 4 Dead 2?". Well little Timmy, the reason is that Valve butchered it in Left 4 Dead 2. A lot of the levels are a lot easier due to more weapons, or harder due to more special infected. Certain character lines and events are missing, common infected look out of place, and so on.
Honestly, I prefer only having 5 special infected. (Smoker, Hunter, Tank, Witch, Boomer.) The Spitter, Jockey, and Charger just seem so out of place in Left 4 Dead 2's Left 4 Dead campaigns.
Anyway, to close things off, I do recommend this game. The community that still plays this game is quite small, but I still manage to find a game when I do play.
10/10. Buy L4D2 if you want more players, buy L4D if you want better gameplay (In my opinion)