Day Of Defeat is a WW2 FPS shooter with no story but a massive multiplayer scene. On standard servers you either play as America or Germany and have to take control of 5 different points to win a game. You can also play a bomb mode in which your team and the enemy team has 2 bombsites in which you have to stop the enemy from planting said bomb. The rag-doll physics in this game are absolutely hilarious.