Coffee Stain Studios has released the first trailer of Sanctum 2 , title for Live Arcade and PSN halfway between FPS and tower defense . in the game we will indeed resist the onslaught of waves of aliens at first by placing defensive towers and walls, and then immerse us in action along with three other friends in co-op online to bump off the insettoni. There will be all clearer watching the following video; the game is expected in the spring.