Undead Underworld

Undead Underworld is a Single Player level in Q2.

Walkthrough
Turn left and collect the Double-Barrelled Shotgun beside the doorway, then go through the doorway. Kill the 2 Grunts and the Ogre, then go through the doorway to the right. Kill the Grunt and 2 Ogres. Collect the 3 Shells across from the entrance and go through the doorway to the left. Turn right to kill the Scrag and Rottweiler, then turn left once more to proceed through the doorway straight ahead. Kill the 3 Grunts and collect the 2 Nails across from the entrance, then go through the doorway to the left. Kill the 3 Grunts and 2 Knights, then turn right. Collect the 2 Nails and 25 Health in the upper right corner, then go through the doorway straight ahead to kill an Ogre. Return to the corridor with the Scrag and Rottweiler, then start to proceed down it. Enter the doorway on your right to kill 2 Ogres and 2 Grunts. Collect the three 25 Health in the lower left corner, then return to the corridor. Go through the doorway at the end to kill the Scrag and Rottweiler. Go through the doorway to your left, ignoring the doorway to your right. Kill the 3 Knights and the Rottweiler. Collect the Nailgun diagonally across from the entrance and go through the nearby doorway. Kill the Ogre while collecting the 2 Rockets, then return to the previously ignored doorway. Kill the 2 Fiends, then turn left. Collect the 3 Rockets to the left and the Green Armor by the doorway to the right. Go through the doorway to collect the Grenade Launcher, then kill the 3 Zombies.