Sanctum 2 is now free if you claim it within the next two days

Humble Bundle is a great place to get a deal on games, whether from their store, the monthly subscription service, or a bundle where you can pay as much as you think the games are worth. However, they also have a reputation for offering up the occasional free game. This time the tower defense game, Sanctum 2, is free for 48 hours.

Sanctum 2 takes a different approach to the tower defense genre. It starts off in a familiar mode where you build walls and towers to defend your base from waves of unrelenting hordes. But where other games would have you stay in an overwatch position so you can continue building and upgrading defenses, Sanctum 2 switches to a first-person shooter. You then fight as a soldier in the field facing wave after wave with your trusty rifle in hand.

Once you add the game to your cart and checkout, you will be provided with a steam key. There is no need to add any other games; you can check out with a zero-dollar balance. This deal is available until 10 AM (PST) 26 November, and you have until 10 AM (PST) 9 December to redeem the Steam key.