Coffee Stain Studios' sci-fi tower defense first-person shooter, Sanctum, will be free to play on Steam this weekend and the original game bundled with map packs and the official soundtrack will be available for 75 percent off.

From October 11th-14th, players will be able to check out Sanctum for free on Steam before deciding if they want to buy the game. During this weekend the original game bundle will also be on sale, while those who already own the game will be able to pick up the DLC packs, which will be sold separately at a 20 percent discount.

Sanctum is currently available on both PC and Mac.