Pyramid Warp

Every pyramid contains 15 rooms having specific configurations, but may appear in random order. The items are also not always in the same boxes. Four marauding monsters (two vampire bats and two scorpions) leave the portal, and wander the maze haphazardly, causing death on contact. These monsters can be shot, after collecting the gun on that level, after which they will return to the portal to re-spawn. If you find the mummy, it will pause a while before starting to track you down, which it does relentlessly. It is invulnerable to your weapon, but you can escape it by using one of the warps. There is also a timer, corresponding to your air remaining in the tomb. You must leave the room before your air supply is exhausted.