While Counter-Strike was easily the most popular mod developed out of the Half-Life engine, another mod based on World War II, Day of Defeat, also turned out to be quite a hit. Like Counter-Strike before it, the mod eventually made it onto store shelves as its own retail product. So it only makes sense that Valve would port this popular game over to its flashy new Source engine as it did with Counter-Strike. While a lack of maps cuts into the game's value somewhat, Day of Defeat: Source still offers a satisfying and exciting experience for those who just can't get enough of World War II.

Pros:
-great graphics
- realistic weapons
- overall amazing game

Cons:
- Only 4 classes
- to much recoil on the springfield
- can only be one smiper at a time