Quake 2

Level select:
Press ~ to display the console, then type map <level code> using the following information.

Name	Level code
Outer Base	base1.bsp
Installation	base2.bsp
Comm Center	base3.bsp
Lost Station	train.bsp
Ammo Depot	bunk1.bsp
Supply Station	ware1.bsp
Warehouse	ware2.bsp
Main Gate	jail1.bsp
Destination Center	jail2.bsp
Security Complex	jail3.bsp
Torture Chambers	jail4.bsp
Guard House	jail5.asp
Grid Control	security.bsp
Mine Entrance	mintro.asp
Upper Mines	mine1.bsp
Borehole	mine2.bsp
Drilling Area	mine3.bsp
Lower Mines	mine4.bsp
Receiving Center	fact1.bsp
Sudden Death	fact3.bsp
Processing Plant	fact2.bsp
Power Plant	power1.bsp
The Reactor	power2.bsp
Cooling Facility	cool1.bsp
Toxic Waste Dump	waste1.bsp
Pumping Station 1	waste2.bsp
Pumping Station 2	waste3.bsp
Big Gun	biggun.bsp
Outer Hangar	hangar1.bsp
Comm Satelite	space.bsp
Research Lab	lab.bsp
Inner Hangar	hangar2.bsp
Launch Command	command.bsp
Outlands	strike.bsp
Outer Courts	city1.bsp
Lower Palace	city2.bsp
Upper Palace	city3.bsp
Inner Chamber	boss1.bsp
Final Showdown	boss2.bsp

Unlimited ammunition:
Begin a normal game, under any difficulty setting. During game play, press [Esc]. Select "Multiplayer", then "Start Network Server", then "Deathmatch Flags". Find the option for unlimited ammunition and turn it on, but do not start a multi-player game. Instead, press the [Esc] until your game resumes. You will now have unlimited ammunition.
Apathy.

Hint: Raven sign:
In Episode 2 Map 7 (secret level) shoot all of the gargoyle faces once. They will bleed. Then, move to the long, flashing corridor where you encounter two Hell Knights in alcoves. Shoot the wall of the second alcove to reveal a hidden room containing the initials of Tim Willits and Teresa Chasar, along with a raven symbol for the raven levels that they made for Doom 2.
EdgeCrusher.

Hint: Defeating the Makron:
Shoot him in the head with a rail gun. He will fall over and not be able to attack you. Note: This only works when he is small.
rohan schemioneck.

Hint: Avoid fall damage:
When falling from high locations, hold [Jump] and you will receive any damage.
Brian Almeida.

Hint: Developer gallery:
In the room after you defeat the Makron, press one of the buttons next to the sliding doors in the floor. Run to the other side of the room where there is another button and door. Run into the door in the floor before it closes. Go down the passageway until you see a button on the wall. Turn around the corner and you will see a crack in the wall. Shoot it and go through the passageway. You will see an on screen message stating "Welcome to the id gallery" or something similar. In here you will see the pictures of the game's development team and buttons on the floor. Once you push all the buttons on the floor, a hole will be blown open in the floor. Note: Activate the buttons on the floor and the pictures are done as follows. Press the first button on the right and the picture in front of it will slide down into the floor. A gray picture will burn you. If you press the floor button in front of the other gray picture (across from the red one), it will explode. The red one's mouth slides open and a few body parts will fall out. If you push the button in front of the last one down (the blue one) it will start to spin. Once the hole is blown open in the floor, explore it. You will find a pool and a Tank having a pool party with two Iron Maidens and two tortured Marines on either side. Do not bother shooting the Tank and the two Iron Maidens as they will not shoot back and they are invincible. The only way out of here is back the way you came.

Glitch: Unlimited ammunition:
Note: This trick requires v3.20. Start a normal single player game. Go to main menu, then select "Multiplayer" and select "New Server" (but do not start a server). Go to game settings (deathmatch flags) and turn on the infinite ammunition option. Return to your normal single player game for unlimited ammunition.
Preston Flood.

Glitch: No falling damage:
Note: This trick requires v3.20. Start a normal single player game. Go to main menu, then select "Multiplayer" and select "New Server" (but do not start a server). Go to game settings (deathmatch flags) and turn off the falling damage option. Return to your normal single player game for no falling damage.
Preston Flood.