Sanctum 2 [Online Game Code] First-Person Shooter  Dont just sit back and watch, jump into the action yourself! Tower Defense  Design complex mazes and build powerful towers to stop the enemies from destroying the Cores. In-game Visual Novel  Unlock a comic-book page for every map you beat to discover the secrets of LOEK III. Progression System  Increase your rank and unlock new weapons, towers and perks. 4-Player Co-op  Progress through the storyline yourself or team up with other players whenever you want.