Diverting from their usual weekend promotions Steam is selling the popular Call of Duty: World at War at just $24.99 instead of the standard $50. The offer launched yesterday afternoon as part of a “mid-week madness” sale and will run only for a couple of days, ending Thursday, so if you’ve been sitting on the fence waiting for a good deal then jump on it soon.

The fifth installment in the Call of Duty series takes players back to World War II, and focuses on the initial battles of in the Pacific and Eastern Europe involving the United States, the Empire of Japan, the Soviet Union, and Nazi Germany. There’s four-player co-op; the multiplayer remains similar to the immensely popular online system that debuted in Call of Duty: Modern Warfare; and (sweetening the deal even more) map packs for the game are free to PC users.