Doom 2: Hell On Earth

Cheat mode:
Type one of the following codes to activate the corresponding cheat function. Note: Cheat mode cannot be enabled in multiplayer mode.

Effect	Code
Radiation suit (60 seconds)	idbeholdr
Invisibility (60 seconds)	idbeholdi
Invincibility (30 seconds)	idbeholdv
Computer map	idbeholda
Night vision goggles (120 seconds)	idbeholdl
Strength1	idbeholds
Chain saw2	idchoppers
Level select3	idclev<level number 01 - 32>
God mode	iddqd
Full map4	iddt
All weapons and ammo	idfa
All keys, weapons, ammo	idkfa
View current coordinates	idmypos
Play music from indicated level	idmus<level number 01 - 32>
No clipping	idclip

1. Although this code will last during the entire level, the screen will be blank for thirty seconds.
2. Press 1 to use the chainsaw after enabling the code.
3. Levels 31 and 32 can not be accessed under Nightmare mode.
4. Enable this code while the map is displayed to display the full map. Enable the code a second time to display all opponents and objects. Hold [Ctrl] and enable the code four times during a death match to display the other players.

Hint: Backwards sound:
If you play the challenge made by the final boss backwards, you will hear him say "To win the game you must kill me, John Romero".
Information in this section was contributed by EdgeCrusher.

Hint: Thousands of monsters:
Near the end of level 30 when there are no monsters, the face still shoots out monsters. Enable the idclip code and go through the same wall as "boxes" are going through. Either save your game or enable the iddqd code. There are thousands of monsters to kill.
Information in this section was contributed by robert rubenok.

Hint: Get to Grosse level from Wolfenstein:
When you get to the end of the Wolfenstein level, before you open the door to the final door enable the idclip code. Looking at the door, go into the right wall. Search around until you get to a room with another exit. Click the exit button in that room to go to a different screen with the message "You have found the super secret level. You should fly through this one." It says this because there is a Cyber Demon ahead.
Information in this section was contributed by SecreTEmpirE1.

Hint: Rocket launcher on level 1:
When you enter the room with the large window, look along the left wall until you get to a switch. Hit the switch then get on the platform and wait for it to rise. Kill any enemies in your way. Then, click the "Open Door" button on the wall you are now facing. The wall should open. Again, clear out any enemies in your way. Go the the far end of that passageway and look toward the room. Hold [Sprint] and run off the platform and onto the lighted square. You should hear the faint noise of a door opening. Go to the room where the blue life jars were located. The door in the back of that room should have opened up to reveal a rocket launcher.
Information in this section was contributed by SecreTEmpirE1.

Hint: Secret room level 1:
Once you get to the exit door (do not open it), go straight back, a short distance past the imp's cage. Press the "Open" button on the wall, and a door will open.
Information in this section was contributed by BFPS1.

Hint: Getting outside in level 1:
Go to the lift near the end of the level, which is also used to open the rocket launcher room. Open the secret door and activate the switch, then get off the lift and walk up to the window. Walk to the right and there will be an opening to the outside. If playing under the Ultra Violence setting or higher there will be imps outside. There will also be a shotgun and some shells.
Information in this section was contributed by Pizxe.

Hint: Hidden items in Wolfenstein level:
Once you start, display the area map and enable the iddt code. You will see a cross-shaped room at the top right corner of the map. Mark it and go to it. Once you reach a wall with a skull on a spear in front of it, press "Open" and follow the stairs. You will find a BFG9000,a Megasphere, and a pack full of ammunition.
Information in this section was contributed by BFPS1.

Hint: Completing Icon Of Sin:
In the last level, Icon Of Sin, there is a giant face that keeps launching "boxes" through a hole in his forehead. You must activate the platform. Take the invulnerability just in case, and while going up, aim with the rocket launcher at the correct moment so that the rocket goes through the hole from where the boxes appear from. Repeat this as many times as needed.
Information in this section was contributed by John Smith.

Hint: Monsters attack each other:
You can get different species of monsters to attack each other (for instance, an Imp and a Demon).
Information in this section was contributed by 4I Falcon.

Glitch: Monster hearing:
Monsters can hear you punching air, but do not seem to be able to hear the dull roar of an idling chainsaw.
Information in this section was contributed by 4I Falcon.