Initial Horror

Initial Horror is a Single Player level.

Quick Level Completion

 * Kill the 2 Knights, then jump up the staircase that triggered by killing them.
 * Open the Door straight ahead, then drop to the floor below.
 * Collect the Nailgun straight ahead to open the Movable Wall straight ahead.
 * Drop into the Water straight ahead.
 * Swim to the larger area, then collect the Biosuit.
 * Return to the Nailgun room, then kill the Monsters in the room that has opened to the left.
 * Turn around to enter a room that has opened from killing the Monsters.
 * Let the Wind Tunnel push you into the next room, then turn around to kill the 2 Knights.
 * Head up the Elevator straight ahead, then proceed through the Teleporter.
 * Proceed through the Door into the next room, then head through the next Door straight ahead.
 * Head up the spiral staircase, jumping on each platform, to reach the upper floor.
 * Turn left at the top, then drop to the light fixture holding the Super Nailgun.
 * An Elevator will drop you to the floor below, proceed forward to reach the next room.
 * Head around either side of the wall, then drop to the floor in the middle of the two balconies.
 * Turn around, then head down the pit to reach a Movable Wall on the far side.
 * Drop into the room below, then turn left.
 * Proceed forward to reach a platform, jump onto it to hit a Button.
 * Turn around to head down the bridge once more.
 * Proceed through the Door that has opened at the end, then turn right into the corridor.
 * Head down the staircase and turn right at the end of the corridor.
 * Head to the wall before turning right once more.
 * Head through the doorway, then turn left.
 * Move forward into the middle of the area, then turn left once more.
 * Head up the ramp in the middle of the room, then go through the Moveable Wall at the top.
 * Proceed forward to exit the level.

Walkthrough
As you spawn into the level, move in a circle in the small area around you to collect a Double-Barrelled Shotgun from every side but straight ahead, or 3 in total. Kill the 2 Knights that drop into your area, 1 in front of you and 1 behind you. A Section of Staircase will lower in front of you to allow you to reach the floor above, behind is a too steep floor to reach, so instead head up the staircase straight ahead. Open the Door at the top to kill the Ogre inside, then collect the Grenade Launcher and Shells to your left. Straight ahead is a drop into the next room, proceed forward into it while dropping, then turn around to kill 2 Death Knights. Turn around once more, then collect the Rockets and 25 Health in the area to your left. Turn right, then jump across the ramp to collect the 25 Health, Rockets, and Nails. Turn around once more, then drop to the ramp in the middle of the area to collect the Nailgun. Kill the Ogre that spawned straight ahead, then turn around to kill the Enforcer that spawned. Turn left to kill 2 Enforcers behind the Movable Wall that opened when you collected the Nailgun. Head forward into the pool of Water. Kill the 2 Rotfish, 1 in front of you and 1 to your left. Look downwards to see a platform and kill 4 Zombies. Collect the 2 Shells and Rockets on the platform, then swim forward into the larger open area. There is a set of bars with Water at the top, you can use the middle hole to catch your air, though there is no other purpose for this. Collect the 25 Health to your right, then collect the Biosuit on the platform just below you. Turn right to kill the 2 Enforcers, then turn around to kill the Death Knight. Retrace your steps to the room with the Nailgun.

Kill the Ogre that is patrolling the area at the top of the ramp, then head up it before turning left. A new alcove has been revealed, kill the Death Knight, Rottweiler, and Enforcer inside. Turn around, a Movable Wall has opened up from killing the Monsters. Head into the newly opened room, you will be pushed forward by a Wind Tunnel through a Movable Wall into the next room. Turn around to kill the 2 Knights, then turn around once more as a Movable Wall opens from killing them. Kill the Fiend and 2 Enforcers in the next are. Proceed forward to go up an Elevator, then go through the Teleporter. As you land, you will collect the Shells and Nails. You are now at the top of the ramp near the start that was too steep for you to reach. The area you land in will also result in the Door opening straight ahead, kill the Ogre patrolling around the next section. Retrace your steps to the Nailgun room to find things have changed a bit since you left  (#1) . Enter the next room, then look upwards to kill the 2 Enforcers to the left and Enforcer to the right. Head to the empty area to the left of the Door to look upwards and kill another Enforcer. Head through the Door across from the Door you used to enter this room. Head up the spiral staircase, a series of platforms you must jump to, while collecting the Nails. Use the beam to your right to reach the alcove on the far side  (#2) . Drop to the light fixture near the beam used to enter the upper floor to reach a Super Nailgun and 2 Nails, an Elevator will lower you to the floor below. Kill the 3 Scrags that spawned above you, then kill the Ogre and Fiend through the area behind the Movable Wall that opened when you collected the Super Nailgun. Proceed forward to reach a wall, then head around either side to kill 2 Death Knights. Turn to the opposite side to kill the other 2 Death Knights. Head to the far side of the platform to collect the Shells and Nails, then head to the opposite balcony to collect the Shells and Nails. Collect the Green Armor on the right balcony from the wall.

Look into the hole between the two balconies to kill the Vore on the floor below. Collect the 2 Rockets on the staircase leading down to the lower floor, on the far side from the entrance to the room, then head down the area where you killed the Vore. At the far side is a Movable Wall in the floor that drops you to the next room. Turn right to kill the Ogre, then turn around to kill another Ogre. Collect the Shells and 2 Nails beside the wall to your left. This area is a bridge suspended over a pool of Lava, behind you is a Door that is currently locked. Head straight ahead to collect the two 25 Health, Shells, and 2 Rockets. Jump onto the platform straight ahead to press the Button, then quickly turn around. Kill the 2 Knights that spawn close to you on the bridge as the number "1" appears. The number "2" will appear, kill the 2 Knights a bit further on the bridge. The number "3" will appear, kill the 2 Knights a bit further on the bridge. Finally, the number "4" will appear and the Door on the far side will open, kill the 2 Fiends behind this area. Head through the opened doorway, then turn right into the corridor to kill the 3 Death Knights. Return to the bridge, then turn left to look at a Movable Wall that is opening from killing the Death Knights. Use your vantage position to kill the Shambler that appears, then return through the doorway into the corridor where you killed the Death Knights. Head down the staircase while collecting the 4 Nails. Collect the two 25 Health, then turn right and head to the wall. Turn right and head through the doorway, then turn left to look into the area where you killed the Shambler. Head to the middle of the room, then turn left to look into it. Kill the 3 Scrags roaming the vicinity, then head up the ramp straight ahead. Open the Movable Wall at the top, then continue forward through a Teleporter to exit the level. As you enter the Teleporter, you will receive the message "Goodbye, traveller".

Glitches

 * While the beginning slope is too steep to climb, the player can perform a running jump to it if timed right. This can allow players to bypass the first half of the level.
 * It is very easy to get stuck in the Wind Tunnel. The trigger to open the Movable Wall is in the middle of the section, meaning approaching the room from a side can result in bypassing the trigger. This becomes problematic due to the Wind Tunnel constantly pushing the player, preventing them from reaching the trigger.