You think Tower Defense games are all about building? You thought wrong. Sanctum is not your average Tower Defense title. When the havoc starts, you get to join the fray! As one of the world’s first First Person Shooter – Tower Defense games, Sanctum has taken the best of both worlds to deliver an epic, one-of-a-kind experience. Features 4-player co-op support; why double the trouble when you can quadruple it? 5 fancy, physically-improbable Weapons! 4 Challenging Game Modes Don’t just build towers. Build mazes! Your way or the highway! Our Customization System lets you have it all. Powered by Unreal, Sanctum is one of the pin-up girls of the indie games. 87 Achievements Hidden Secrets & Easter Eggs. Have meta with your metal.