Sanctorus is a room in Arcterra of the Tetra Galaxy. The area features a puzzle using the Imperialist sniper weapon. Samus must solve the puzzle to get a portal key and to open the door out. Upon entering the room there are three paths to take. The left path has a Universal Ammunition Expansion and a hole leading to the bottom of the room. The center path leads to the bottom of the room just like the hole in the previous path. The right path leads to two more paths, both that lead to the bottom of the room.