Age of Empires

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BIG BERTHA : Changes your Catapults into Big Berthas with increased range and greater damage radius.
BIGDADDY : It looks like a Camaro Z28 with a guy and a rocket launcher in the driver's seat. Most deadly.
BLACK RIDER : Changes your Heavy Horse Archers into Black Riders.
COINAGE : Gives you 1000 gold.
DARK RAIN : Disguises composite bowmen as trees when they are at rest.
DIEDIEDIE : Everyone is destroyed.
E=MC2 TROOPER : Gives you a much more powerful Nuke Trooper.
FLYING DUTCHMAN : Juggernaughts turn into Flying Dutchmen.
GAIA : Allows you to control the animals individually.
HARI KARI : Kills off all your units, including buildings.
HOME RUN : You are victorious.
HOYOHOYO : Gives your priests 600 hit points and makes them move very fast.
ICBM : Increased Ballista range.
JACK BE NIMBLE : Heavy catapult will now fire cows and villagers..
KILL# : # is a number indicating the position of a player (1,2,3,4,5,6,7,8). Can be used to eliminate an enemy without wiping the map clean.
MEDUSA : This one is weird. It makes one of your units a Medusa. Get him near an enemy and when the Villager dies, he will turn into a Black Rider. Let him die one more time and he turns into a Catapult!
NO FOG : Eliminates fog of war and displays enemy units.
PEPPERONI PIZZA : Gives you 1000 food.
PHOTON MAN : Gives you the Nuke Trooper.
QUARRY : Gives you 1000 stone.
RESIGN : You are defeated.
REVEAL MAP : Reveals the entire map.
STEROIDS : Almost instantaneous building.
WOODSTOCK : Gives you 1000 wood.
(Information from Cheat Machine)