Heroes of Might and Magic 3 (PC)

During the game, press the TAB key and type:

NWCTIM: Gives you all magic + 999 spell points
NWCGENERALDIRECTION: Shows the entire map
NWCALREADYGOTONE: Shows all secret items
NWCTROJANRABBIT: Instantly win the scenario
NWCANTIOCH: Hero gets a tent, ballista and ammo
NWCFLESHWOUND: Hero gets death knights
NWCIGOTBETTER: Adds a level to your hero
NWCCOCONUTS: Receive unlimited move points
NWCCASTLEANTHRAX: Gives maximum luck
NWCMUCHREJOICING: Gives maximum morale

Gex 3: Deep cover Gecko (Playstation)

Pause the game at anytime, then press and hold L2 while you enter the following:

UP + CIRCLE + RIGHT + UP + LEFT + RIGHT + DOWN: Allows the debug menu. Press select after un-pausing to enter the menu, and press select again to exit the debug menu
DOWN + UP + LEFT + LEFT +TRIANGLE + RIGHT + DOWN: Grants invincibility
DOWN + RIGHT + LEFT + CIRCLE + UP + RIGHT: Gex Quotes on demand. Press select after un-pausing to hear a Gex quote anytime while playing.

Powerslide (PC)

When you enter your name, put in Megasaxon to enable all cars and tracks. During the game type in the following, and you will see an icon appear.

BLAST: Repels other cars
BOMB: Launches a bomb
GLIDER: Makes your car act like a glider
HOVER: Allows you to hover
LIGHT: Reduces the weight of your car
SLEEP: Prevents AI cars from steering
SLIPPY: Makes everything slippery
SPIDER: Allows you to stick to any surface
SUCK: Makes cars attract each other like magnets
TIMEWARP: Slows time for AI drivers
TWISTER: Causes invisible tornadoes that affects the AI

Need for Speed: High Stakes (Playstation)

Go to the user name screen under options and enter the following:

Hotrod: Drive a Titan Hotrod.
Flash: Drive the Phantom car
Whirly: Use a helicopter! (test drive only)

Acceleration and drunk driver Cheat:
UP + TRIANGLE + X: Press and hold before the race loading screen until the race starts, then honk the horn to get a speed boost.
UP + R1 + L2: Press and hold before the race loading screen until the race starts. If you did it right you'll see the difference :-)
Note that you need to reset the game to use anyother cheat.

Army Men 2 (PC)

To enable cheat mode, hot the BACKSPACE key, and type: !when all else fails. Hit BACKPACE again and type one of the following:

!BEAUTIFUL NIKITA: Infinite use of the snipper riffle
!DOCTOR DOCTOR: Restores you to full health
!GERONIMO!: Calls in an air strike
!I HAVE A ROCK: Infinite grenades
!JUMPJETS: Let's you fly
!VILLAGE PEOPLE: Infinite flamethrower
!SANTINI: Puts you in God mode.
!PAPER DOLLS: Calls in paratroopers
!VENI VIDI VINCI: Wins the mission

Railroad Tycoon 2 (PC)

Press TAB to get a small cursor and type these:

Bigfoot: Win instantly
BoBo: Lose scenario
King of the Hill: Gives $100 million to caracter
Cattle Futures: Gives $1 million to caracter
Powerball: Gives $100 million to company
Slush Fund: Gives company $1 million
Let me in: Gives access to all denied land
Speed Racer: Doubles train max speed
Viagra: Increase city size
Casey Jones: All other companie's trains crash
Amtrak: Company loses $1 million

NHL Hockey 99 (PC)

Type these cheats during the game:

awaygoal: Gives the away team a goal
homegoal: Gives the home team a goal
eaonline: TCP/IP cheat
headbone: Big heads
buffed: Huge players
1999: Stanley cup video
quicker: Every player is faster and better
nobody: Empty arena
gulliver: Tall goalies
warp9: Superfast gameplay
crankit: Unlocks all resolutions for D3D (can cause crashes)

Rages of Mages (PC)

During the game press enter, type the code, then hit enter again. All codes are case sensitive:

#Chicken: Enables cheating (use this one first!)
#show map: Opens the map
#hide map: Close the map
#pickup all: Picks all sacks
#event x: shows conversations from units in the current level. Replace X with any number
#victory: Completes the mission
#killall: Kills all enemy units
#create Very Rare Crystal Two Handed Sword: Makes a two-handed sword.
#create None Gloves: Makes mage gloves for Air skill, and only works with the Mage character