User Summary Ever played a Tower Defense game and wondered what it would be like to be in amongst the action?? Well Sanctum gives you the opportunity to find out, seemlessly combining Tower Defense with First Person Shooter. Play single-player, or co-op multiplayer as a team of up to 4 players. Build powerful defensive towers and upgrade your weapons during building mode, then face off against the advancing enemies in extermination mode. Sanctum is a great value for money indie game, based on the Unreal 3 engine, with high quality graphics and gameplay.