Quake
When you enter these cheats you'll need to bring
up the CONSOLE or by using the (~) key or hit ESC,
selecting Options and then Console.(this way takes
to long!) Then your set to type in the following 
cheats to get what ever ya want!
CODE                  RESULT
----------------------------------------------------------
GOD           - god mode(don't use it too long,cuz it'll                           say "Jhon Doe has died of boredom!")
GIVE S        - shotgun shells (replace ? w/ any # 255 or                                lower)
GIVE C        - battery charge (replace ? w/ any # 255 or                                lower) 
GIVE R        - rockets (replace ? w/ any # 255 or lower) 
GIVE N        - nails (replace ? w/ any # 255 or lower) 
GIVE H        - health (replace ? w/ any # 999 or lower)
NOCLIP        - allows ya 2 walk through walls
MAP E1M       - warp to ? map (replace ? w/ #)
IMPULSE 255   - quad damage mode
NOTARGET      - enemies don't see ya untill you shot at em
FLY           - ya can fly (use D key for up, C key for down)
IMPULSE 11    - gives you the jewels (1 for every time ya use                     it- you'll only need to use it 4 times)
SV_GRAVITY -50 -reduces gravity(repalce w/ any #)
Impulse 9 - 
Quake II
Type in all cheats in the Quake II 
console (use ~ key to bring it up).
Code                        Description
---------------------------------------------
g_unlimited_ammo 999        Unlimited ammo.
give all                    All weapons, items and full ammo.
give adrenaline             Adrenaline.
give airstrike marker       AirStrike marker.
give ammo                   Full ammo.
give ammo pack              Ammo pack.
give ancient head           Ancient head.
give armor                  200 body armor.
give armor shard            Armor shard.
give bandolier              Bandolier.
give bfg10k                 BigFu*kingGun10k.
give blaster                Blaster.
give blue key               Blue key.
give body armor             +1 body armor.
give bullets                50 bullets.
give cells                  50 cells.
give chaingun               Chaingun.
give combat armor           Combat armor.
give commander's head       Commander's head.
give data cd                Data CD.
give data spinner           Data spinner.
give environment suit       Environment suit.
give grenade launcher       Grenade launcher.
give grenades               5 grenades.
give health                 100 health.
give jacket armor           Jacket armor.
give machinegun             Machinegun.
give power cube             Power cube.
give power shield           Power shield.
give pyramid key            Pyramid key.
give quad damage            Quad damage.
give railgun                Railgun.
give rebreather             Rebreather.
give red key                Red key.
give rocket launcher        Rocket launcher.
give rockets                5 rockets.
give security pass          Security pass.
give shells                 10 shells.
give shotgun                Shotgun.
give silencer               Silencer.
give slugs                  10 slugs.
give super shotgun          Super shotgun.
give weapons                All weapons.
god                         God mode.
noclip                      No clipping mode.
notarget                    Enemies won't see you.
sv_gravity ###              Sets gravity to ###.
Quake II - Ground Zero
NEW "GiVE" AND "MAP" COMMANDS 
iN "QUAKE 2 - GROUND ZERO"
New Weapons (with Ammo) & PowerUps:
(use as "give" commands like in normal Quake2)
ChainFist
ETF Rifle
Plasma Beam
Prox Launcher
Tesla
Double Damage
Hunter Sphere
Defender Sphere
Vengeance Sphere
A-M Bomb
IR Goggles
Doppleganger
Ammo for ETF Rifle:
-------------------
Flechettes
Ammo for Prox Launcher:
-----------------------
Prox
You can also type:
- "give all"
or:
- "give weapons"
or:
- "give ammo"
LEVEL LIST
==========
I know that the maps names are listed in the documentation
of Ground Zero, but I found out that there are three other
maps not shown in the list in the documentation. So I listed
them all up here.
(use as "map" commands like in normal Quake2)
1-Player Maps:
--------------
RMINE1     Lower Mines
RMINE2     Mine Engineering
RLAVA1     Thaelite Mines
RLAVA2     Tectonic Stabilizer
RWARE1     Eastern Warehouse
RWARE2     Waterfront Storage
RBASE1     Logistics Complex
RBASE2     Tactical Command
RHANGAR1   Research Hangar
RHANGAR2   Maintenance Hangars
RSEWER1    Waste Processing
RSEWER2    Waste Disposal
RAMMO1     Munitions Plant
RAMMO2     Ammo Depot
RBOSS      Widow's Lair
Multiplayer Maps:
-----------------
RDM1      The Low Road
RDM2      The High Road
RDM3      Boxed In
RDM4      Razor Close
RDM5      Stone Hinge
RDM6      Nexus
RDM7      Sewer Citadel
RDM8      Styx and Stones
RDM9      Scenic Overlook
RDM10     Great Divide
RDM11     Dish It Out
RDM12     Fall From Grace
RDM13     Roads To Nowhere
RDM14     Rogue's Edge
Misc. Maps:
-----------
RUNIT2      \
RUNIT3       > Weapon- & Ammo Depot for Units 2, 3 & 4
RUNIT4     _/
Quest for Glory 2
If you were smart enough to cut the beard of the
dude in the desert and bring it to Keepon Laffin'
and did "SELL BEARD" you received a lotsa money
for it.
You don't need the beard to receive money, just do
"SELL BEARD" and he'll give you money.  You can do
this as many times as you like.

Qix For infinite lives in this game, use the DOS utility DEBUG. First backup the game to be edited, then type the following from the DOS prompt: ren main.dat cheater.cht debug a 100 mov dx,es add dx,1000 mov es,dx g 108 r ip 100 ncheater.cht l e es:11aa 0 e es:11d1 0 Then type: w q Then rename CHEATER.CHT back to its previous name.

Quadralien
Codes    Level
----------------
170961 - Level 1
010655 - Level 2
610169 - Level 3
Quake 3 Arena [beta\Test]
In order to use cheats, the SERVER must create a game 
with Cheats Enabled (using devmap - Ex. "devmap q3test1").
While playing a game with Cheats Enabled, bring up the 
console and type the following commands:
Code                       Result 
---------------------------------
god -God Mode 
give all                 - Get All Weapons & Grappling Hook 
give health              - Get Health 
give armor               - Get Armor 
give quad damage         - Get Quad Damage 
give personal teleporter - Get Personal Teleporter 
give gauntlet            - Get Gauntlet 
give machinegun          - Get Machinegun 
give shotgun             - Get Shotgun 
give granade launcher    - Get Granade Launcher 
give rocket launcher     - Get Rocket Launcher 
give lightning gun       - Get Lightning Gun 
give railgun             - Get Railgun 
give plasma gun          - Get Plasma Gun 
give bfg10k              - Get BFG10K 
give grappling hook      - Get Grappling Hook 
give ammo                - Get Ammo 
Load Demo-Maps:
---------------
map q3test1  - Demolevel 1
map q3test2  - Demolevel 2
Sarge Character
---------------
Use a command line/prompt for this one
Change into your Quake 3 Directory
type "cd demoq3"
then "edit q3config.cfg"
a MS-DOS like edit box should come up.
search for a line that says somthing similar to "seta model"....
Change this so the name before the "/" is "sarge" and when 
quake is run, the character you will be playing with is the 
sarge player.Quake II - Juggernaut Level select ------------ Press ~ to display the console, then type map 
 using the following information. Level Level code ---------------- 1 jug1 2 jug11 3 jug9 4 jug16 5 jug18 6 jug8 7 jug3 8 jug17 9 jug10 10 jug19 11 jug13 Deathmatch 1 jdm1 Deathmatch 2 jdm2
Quake I - Missions Pack 1: Scourge of Armageddon
Level select 
------------
While playing a game, press ~ or ` to 
enter the console, then type 
"map HIPE[episode number]M[map number]" 
and press [Enter].
Wetsuit mode 
------------
While playing a game, press ~ or ` to 
enter the console, then type 
"impulse 200" and press [Enter].
Quake I Missions Pack 2: Dissolution of Eternity
Level select 
------------
During gameplay, press ~ or ` to open the console, 
then type "R[episode number]M[map number]" 
and press [Enter]. 
The last level may be reached by typing "R2M8".
Quarantine
Start the game with these paramaters:
 -cheater -infinite -nocar -invince
In game: press Alt-Ctrl-F7 before anyone hits you or you hit them 
and you will be invincible, no cars on the road, and infinite weapons.
Need more money?
Hex edit SAVEx.GAM   (x being game number)
Sector 0, offset 407-408: change to 0F 27
Quest For Glory 4: Shadows Of Darkness
400 Acrobatics points:
----------------------
Import a character from a previous game. Spend all 
available points on the Acrobatics attribute, then  
cancel the character. Import the same character again.
The previously added Acrobatics points will still be 
present. Add to this total and repeat this procedure 
to gain up to 400 Acrobatics points.
Quest for Glory 5: Dragon Fire
To build up your strength, vitality and agility, 
simply press and hold the "G" and "K" keys on your 
keyboard until your stamina runs out. Then rest 
for an hour, and repeat. 
Ok, this is more of a bug than a cheat code, 
but if you do not want to be bothered by 
monsters or do not want to make the balloon 
again, when you have finished; making the 
balloon and Park" it outside Silmaria. 
Then restart your game.
Quiver
WUSS     - God mode
NUKE     - Kills all bad guys
MMAP     - On automap (TAB) will display entire map
PANSY    - All weapons, all ammo
BUTTHEAD - All keys, all objectives
STUN     - Temporarily stuns bad guys
WARP     - junps to a specific level