Level 1
Termination Central

Level 2
The Vaults of Zin

Level 3
The Tomb of Terror

Level 4
Satan's Dark Delight

Level 5
Wind Tunnels

Level 6
Chambers of Torment

Secret Level
The Haunted Halls

The Tomb of Terror is a tiny but complex level with numerous environmental traps. You start in a room with the silver door, a blocked staircase, and a sealed door. Like many rooms in the tomb, you must simply find the Q button (on the other side of the stairs, in this case) to gain access to the next room.

Secret Area 1
Through the first doorway, you’ll come to a room with a Q button on the floor. Stepping on this button creates a staircase over the lava. Ascend the stairs, then look up and to your right, where you’ll see a red Q button. Shoot the button to open a teleporter leading to the beams above, where you’ll find red armor.

After you run up the steps over the lava, turn right and look up. You'll see this Q button high on the wall

Dive in this pool to find a 100 health kit

Secret Area 2
At the end of the corridors filled with zombies, you’ll come upon a room with some death knights and a small set of steps. Next to these steps is a small pool of water. Drop into the pool to find a 100 health kit.

The Silver Key
Eventually, you’ll be returned to the opening room through a teleporter. The stairs will now be accessible. Walk up and turn around. Walk across the beams to the hallway, and follow it around and down. At the end of the ramp, you’ll find the silver key and yet another teleporter back to the opening room.