Quake (cheats)

Code
              Effect
Crosshair 1
              Gives you crosshairs
Fly
              Flying mode (D=up C=down)
Fov X
              Increases peripheral vision (where x is your field of vision)
Give #x
              gives weapon #x - 3=shotgun, 4=nailgun, etc..
Give C #x
              Gives x # cells
Give H #x
              Gives x # health
Give N #x
              Gives x # of nails
Give S #x
              Gives you x # of shells
Give R #x
              Gives you x # of rockets
God
              god mode
Impulse 10
              Pentagram of Protection
Impulse 11
              Rune
Impulse 12
              Limited Gimme
Impulse 13
              Silver Key
Impulse 14
              Gold Key
Impulse 150
              Rocketlauncher to flamethrower
Impulse 252
              Pentagram of Protection (30 seconds)
Impulse 253
              Ring of Shadows (30 seconds)
Impulse 254
              Bio-suit (30 seconds)
Impulse 255
              Quad Damage mode
Impulse 9
              all items
kill
              commit suicide (?)
map e#m#
              level warp
Map End
              Takes you to last level
Noclip
              walk through walls
Notarget
              Invisible to enemies
R Fullbright 1
              Everything is bright
sv_gravity ###
              sets gravity to ###

But wait - There's more!!

Nightmare Skill

Start in Normal skill mode. Go into the 4th episode but don't get into the time portal. When you fall out of the water, go to the
console and type in "Fly". Go up , turn left, and enter the doorway...

or...

Step into the water but don't fall through. Swim all the way against the wall on the same side you enter the water (where the
shield is in deathmatch). Now fall through and you will land on the rafter. Walk on the rafter right into the Nightmare entrance.

If you have a hard time getting anywhere on the rafters, use the NoClip code and walk through walls until you find it.

To be invisible to your deathmatch buddy but not the monsters, type: R_Drawviewmodel 0.

Kasmir Gandalf, Azreal, Ben Ridley, Amanda Bearnik, Josh Riddell, Chris Psaros, Gwhite,
Knut Erik Pedersen, Steven Hagle, Marc Lindenbach, Michael G. Clawson, Ben Shotts, Richard Cunningham, and Aaron and
James for the codes