From Thursday until Monday Morning, you can play Sanctum 2 absolutely free. If you dig the free weekend, you’ll want to snatch it up during this sale because you can get every version of the game for 85% off. This makes the base game $2, the complete pack with DLC $3.74, and a four-pack will only set you back $7. Sanctum 2 has received fairly high marks, and is an FPS/tower defense hybrid that could easily act as a gateway for the latter genre by throwing it in the shell of another game – kind of like the Ratchet and Clank tower defense game on the PS3. If you’ve always wanted to get into the genre, this is a great way to do it, and it’s unlikely that the price will ever be much lower than it is now.