Cheat mode:
-----------
Just type in these codes in the chat window: then press ENTER again.

Cheat             Effect
--------------------------------------------------  
king arthur     - changes birds into dragons (999 HP)
grantlinkspence - Turns animals into Animal Kings.
pow big mamma   - new unit: BabyPrez (Baby on trike) (500 HP, 50 str, 10 arm, 15 rng)
convert this!   - new priest unit ("Saint Francis"), who kills his enemies by lightning 
                  (25 HP, 200 str, 0 arm, 10 rng)
stormbilly      - get a sci-fi robot ("Zug 209") (100 HP, 20 str, 10 arm, 15 rng)

Please Note: Cheats and Hints listed above may not support all versions of the game.

Age Of Empires 

MEDUSA          - villagers become medusa. When villager is killed, he becomes a black rider. 
                  and if killed again becomes a heavy catapult.
DIEDIEDIE       - you all die
RESIGN          - you resign
REVEAL MAP      - reveals all the map
PEPPERONI PIZZA - gives yourself 1000 food
COINAGE         - gives yourself 1000 gold
WOODSTOCK       - gives yourself 1000 wood
QUARRY          - gives yourself 1000 stone
NO FOG          - remove the fog-of-war
HARI KARI       - suicide (a more spectacular way to resign) 
PHOTON MAN      - get a 'Nuke Trooper' (guy /W A laser gun) 
GAIA            - control the animals (You loose control of your humans) 
FLYING DUTCHMAN - juggernaughts turn into the Flying Dutchman 
STEROIDS        - instant build
HOME RUN        - win the scenario
KILLX           - where 'X' is the players position (1,2,3,4,5,6,7,8) 
BIGDADDY        - get a cool car /W a rocket launcher
BIG BERTHA      -  heavy catapults have greater range and damage 
ICBM            - ballistias get 100 range points
HOYOHOYO        - priest speed up alot, and get 600 hit points 
JACK BE NIMBLE  - catapults fire peasants who do somersaults as they fly through the air.
E=MC2 TROOPER   - get a futuristic trooper. who fires nuclear missles which explode when
                  they hit.

Please Note: Cheats and Hints listed above may not support all versions of the game.