Ok here are some cheats for some different games.
Everybody already knows these ones but here they are anyway



doom I-II dark forces quake I-II

Mechwarrior 2 Mechwarrior: Mercenaries Duke Nukem 3D

Commandoes: Behind Enemy Lines Alien vs. Predator Redneck Rampage

BLOOD command and conquer


DOOM I-II

IDDQD -God mode
IDKFA -all weapons keys and ammo
IDFA -all weapons and ammo (no keys)
IDSPISPOPD -clipping mode for DOOM I
IDCLIP -clipping mode for DOOM II
IDBEHOLD

L -light goggles
S -Beserker pack
V -Invulnerability
I -partial invisibility
A -all map
IDCHOPPERS -chainsaw
IDDT -all map **(works only when you are in your map type 2 times)**

Level Codes:

quake weapons

quake enemies

COMMANDS FUNCTIONS
god turns on god mode
fly enables fly mode
kill commits suicide
notarget enemies don't attack until provoked
noclip walk through walls (thanks Chris Flack)
give s # gives # (where # = a number) of shotgun shells
give n # gives # of nails
give r # gives # of rockets/grenades
give c # gives # of cells
give h # gives # of health
give # gives weapon #
map e#m# warps to the episode and mission specified
registered 1 simulates regisered, but will mess if you try to go to episode 2,3 or 4
R_Fullbright 1 no shadows
R_Drawviewmodel 0 Invisibility
SV_Gravity (0-999) changes the gravity
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GOD God Mode
NOCLIP  No Clip Mode
NOTARGET No Target Mode
GIVE ALL  Give all items (except those listed below)
GIVE HEALTH  Give 100 health
GIVE WEAPONS  Give all weapons
GIVE AMMO  Give all ammo
GIVE ARMOR  give armour
g_unlimited_ammo 1  unlimited ammo
 
 
The items below are not given by "GIVE ALL" instead you need to use these console commands to get them
 
GIVE BLUE KEY
GIVE RED KEY
GIVE COMBAT ARMOR 
GIVE AIRSTRIKE MARKER
GIVE ARMOR SHARD
GIVE SECURITY PASS
GIVE POWER SHIELD
GIVE COMMANDER'S HEAD
 
There is one more cheat to get to different maps
 
map (mapname) go to that map (eg. "map base3")
With the level cheat you need to know the name of the map to go to it.  To get map names go to your multiplayer menu and go to start new network server then i shall have the full name of the levels and the shortened name below it.
This is shown in the picture below!

HOLD control alt and shift when entering

BLORB-----Makes you invulnerable.
CIA-----Gives you unlimited ammo.
COLDMISER-----Turns off your heat tracking.
DORCS-----Meet the mw2 designers.
ENOLAGAY-----Destroyes everybody ,everything and YOU!
If you dont want to get blown up, type in : BLORB.
FLYGIRL-----Gives your Mech jump jets.
MIGHTYMOUSE-----Gives your Mech unlimited jump jet juice.
FRONT-----Turns rearview camera to frontview camera.
GANKEM-----Destroys targeted mech.
ICANTHACKIT-----Ends your mission in success.
IDKFA-----Types out "This ain't doom" and kills you.
MEEPMEEP----- Enables time compression.(Time flows slower ).
UNMEEPMEEP-----Disables time compression.
HANGAROUND-----Allows you to stay in the mission after your time expires (Not after the mission is over).
MICHELIN-----Displays bounding spheres on mechs and other objects (makes circles appear around mech parts and objects;
shoot within those circles to damage a specific part of another mech).
TINKERBELL-----Free Floating camera.
-To control it: use the same commands as the ones to control your eye view from the cockpit:(Ctrl+arrows).
XRAY-----x-ray vision (you can see trough building,terrain and ennemie mechs.)
ZMAK-----Enables time expansion (gives you more time ).
DOROS-----Makes the enemies dumb.
LAIRDO-----Writes : "Attention ennemies, don't mess with the blimp!"

hints page

Mech Weapons chart

HOLD control alt and shift when enetering

SUPERFUNKICALIFRAGISEXY -invulnerability
ISEENFIREANDISEENRAIN -unlimited ammo
ITSDABOMBINMYBEAUTIFULBALLOON -add jump jets to mech
CRAZYSEXYCOOL -unlimited jump jets

DNCORNHOLIO or DNKROZ = God Mode
DNSTUFF = All Weapons/Ammo/Items
DNITEMS = All Items
DNMAJOR = Unlimited JetPack Fuel
DNMONSTERS = Makes All Monsters Disappear
DNCLIP = Lets You Walk Through Walls
DNCOORDS = Shows Your Current Coordinates
DNUNLOCK = Locks or Unlocks all Doors
DNKEYS = Gives you all Access Cards
DNSCOTTY### = Warps you to episode # level ## (### is the episode number and level number. ie.
DNSCOTTY111 would warp me to episode 1 level 11)
DNSHOWMAP = Toggles display of map
DNHYPER = Gives you full steroids

Commando's: Behind enemy lines

After beginning the game, type 1982GONZO, then type one of the following:

Shift-X, Effect: Selected commando is teleported to chosen location
Shift-N, Effect: All objects in your field of view are displayed
Shift-Ctrl-N, Effect: Jumps you to the next mission
Ctrl-I, Effect: Your commandos are now invulnerable
SHIFT+V, Trace user. Levels:

Level 2 YJJXB
Level 3 4FQBF
Level 4 5DNCQ
Level 5 6S5TL
Level 6 AT1WN (maybe ATIWN)
Level 7 09VJ8 (maybe O9VJ8)
Level 8 WQ9XB
Level 9 Q2AXT
Level 10 UGPD
Level 11 9WODW
Level 12 VHDC
Level 13 BK48
Level 14 WA8DW
Level 15 KEWD3
Level 16 R7IP3
Level 17 FXIMV
Level 18 ZZMJV
Level 19 8HCWIN
Level 20 C7KWW

Alien vs. Predator

SUPERMUN: Alien gains long-distance jaw attack. To acquire the SUPERMUN,
you must defeat the first Alien level, Temple, and score 10 live civilian head bites.

NAUSEA: The entire screen shakes and moves, causing, well, nausea. To acquire NAUSEA,
you must defeat the second Alien level, Escape, in less than two minutes.

PIPECLEANER: All characters are shown as pipecleaners, or as their skeletons. To acquire PIPECLEANER,
you must defeat the third Alien level, Ferarco, with 15 dead civilian head bites.

MOTIONBLUR: Makes the screen blurry. To acquire MOTIONBLUR, you must defeat the fourth Alien level,
Gateway, in under four and a half minutes with an average speed of 9 m/s or greater.

MIRROR: Mirrors your display of the level. To acquire MIRROR, you must defeat the fifth Alien level,
Earthbound, with one live Predator head bite.

JOHNWOOMODE: When you attack or are attacked, the game slows down. To acquire JOHNWOOMODE,
you must defeat the first Marine level, Derelict, with 80 percent head shots.

GRENADE: Stocks your Pulse Rifle with 99 grenades (but no bullets). To acquire GRENADE,
you must defeat the second Marine level, Colony, with 40 percent accuracy.

WARPSPEED: Run very fast. To acquire WARPSPEED, you must defeat the third Marine level, Invasion, in less than four minutes.

LANDOFTHEGIANTS: Makes you very small. To acquire LAND OF THE GIANTS,
you must defeat the fourth Marine level, Orbital, using less than 20 shots.

SLUGTRAIL: Causes all Aliens to crawl on the floor because they have no legs. To acquire SLUGTRAIL,
you must defeat the fifth Marine level, Tyrargo, with 32 Alien kills.

PIGSTICKING: Gives the Predator's speargun unlimited ammo and extra shots. To acquire PIGSTICKING,
you must defeat the first Predator level, Waterfall, with 80 percent accuracy.

SUPERGORE: Ups the level of blood and gore. To acquire SUPERGORE,
you must defeat the second Predator level, Area 52, with 25 marine trophies.

BALLSOFFIRE: Enemies are always on fire. To acquire BALLSOFFIRE,
you must defeat the fourth Predator level, Fury 161, with 40 Alien kills.

RAINBOWBLOOD: Causes the lights, smoke and blood effects to be rainbows. To acquire RAINBOWBLOOD,
you must defeat the fifth Predator level, Caverns, and be spotted less than 15 times.

IMPOSSIBLEMISSION: Causes the game to be more difficult because you take more damage. To acquire IMPOSSIBLEMISSION,
you must defeat the second Alien bonus level with 20 live marine head bites.

TICKERTAPE: Aliens all have a trail following them. To acquire TICKERTAPE,
you must defeat the first Predator bonus level, Invasion, with 15 alien trophies.

TRIPTASTIC: Causes the screen to be blurry, jittering, and rainbow. To acquire TRIPTASTIC,
you must defeat the second Predator bonus level, Escape, with 10 civilian trophies.

Type in these cheat codes while playing Redneck Rampage.

Code- Description

rdall---------All items and full health.
rdclip--------Toggle clipping mode.
rddebug-------Toggle debug mode.
rdelvis-------Toggle God mode.
rdfuckngoXYY--Go to X episode and YY map.
rdguns--------All weapons.
rdinventory---All inventory.
rditems-------All items.
rdkeys--------All keys.
rdmeadowXYY---Go to X episode and YY map.
rdmonsters----Toggle no monsters mode.
rdrate--------Shows framerate.
showmap-------Shows map.
rdskill#------Change skill number # (1-4).
rdunlock------Toggle locks.

RIOT - All major powerups

NOCAPINMYASS - God mode
CAPINMYASS - God mode off
MPKFA - God mode
IDAHO - Guns and ammo
GRISWOLD - Armor
EDMARK - Kill self
TEQUILA - Guns akimbo
BUNZ - Guns akimbo
FUNKY SHOES - Jump boots
KEYMASTER - Keys
JOJO - Delirium
SATCHEL - Toys
SPORK - Health
ONERING - Invisibility
MARIO - Level warp
MCGEE - Burn self
CHEESEHEAD - Diving suit
VOORHEES - Invulnerability
HONGKONG - Ammo
FRANKENSTEIN - Doctor's bag
STERNO - Blind self
CLARICE - Beast eyes

here are some patches

a multiplayer level defender.zip

a game editor uge10.zip

version 1.22 update patch cp122.zip

Downloads

Rules.ini

Red Alert -- Hyper Edition v3.01 51 kb So far the best rules.ini I've ever seen: easy to install, new units -- Tesla Tanks, stealth vehicles, it's a whole new strategy.
Cyber Alert v1.0 193 kb A rules.ini modification. Lots of new cool stuff: new units & icons for RA, ore trucks go 4 times faster, nuke subs & more!!! Requires Conterstrike mission disk.
C&C -- Warped 26 kb Imagine the Allies, Soviets, GDI, NOD and a futuristic army mixed up in a battlefield and you got C&C -- Warped!!! Requires RA v1.07 and C&C in Red Alert.
AI enhancement 7 kb The AI is now more challenging than ever!!! It'll build mammoth tanks, tech centers, tanyas & more!!! Excellent for skirmish mode.
KewlRa v1.0 17 kb It's a rules.ini i write to be used with Command & Conquer in Red Alert. Check it!!!
Allies Enhanced 10 kb Tired of your Allies getting beat up all the time??? Here's your solution: better, faster, stronger allied units. Now it's an even fight ( he he he ).

Editors & Patches

Red Alert v1.08 patch 1.6 MB Fixes many more bugs in Red Alert. It also allows you to save modem/network games.
RA-Trainer v2.0 19 kb The newest version of RA-Trainer. With Quick-Build, Quick Charge, unlimited money, full map display, and a complete mission key! Plus No More Game Crashing!!!
R.A.C.K. v1.0 beta 3 248 kb Da best scenario editor i have ever seen. Just download it. You'll see.
Flame Dancers: Genesis 1.6 MB In this patch ( it's more a patch than just a scenario ), you are the commander for the Flame Dancers, a group that wants to destroy all mankind not for power, but for the sake of the universe. Professor Einstein discovered that each time we use the chronosphere, the fabric of the universe weakens. This group is willing to sacrifice themselves for the good of this universe...

Miscellanous

Command & Conquer in Red Alert v2.10 402 kb Allows you to put the old Command & Conquer units in Red Alert without using RAMixer.
DXGrab v2.0 576 kb Allows you to take screenshots of Red Alert (with the right colors).
Nurple Map Maker 11 kb Everything on how to make a nurple map yourself.
RAFIX 3 kb Lets you play Red Alert without using the cd. Must have at least 20 mbs approx. of free space and you must own the allies cd.
Command & Conquer -- Sound Ripper 38 kb Now you can rip out the sounds in C&C, Covert Operations & RA and save it in a .wav file.
RAMixer v5.1 250 kb Lets you create, extract & see all of the .mix files in Red Alert. With this new version now you can listen to every sound from the game!!!
Red Alert Ultimate Guide 99.2 kb The purpose of this guide is to let people create their own units and structures for the game Red Alert, AfterMath,Counter Strike...(all the C&C series). Special thanks to RoyForever.
RAVideo 37 kb Lets you see all of the Red Alert movies, listen to all the soundtracks and take movie screenshots!!!

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