Press [ENTER] while playing to bring up chat box, then type:

CodeResult 
ROCK ON   1000 Stone 
LUMBERJACK1000 Wood 
ROBIN HOOD1000 Gold  
CHEESE STEAK JIMMY'S  1000 Food 
MARCO     Reveal Map 
POLORemove Shadow 
AEGIS     Fast Build 
NATURAL WONDERS Control Nature 
RESIGN    You Lose 
WIMPYWIMPYWIMPY Destroy Yourself 
I LOVE THE MONKEY HEADGives VDML 
HOW DO YOU TURN THIS ON     Gives a Cobra car 
TORPEDO#  Kill Opponent # 
TO SMITHEREENS  Gives a Saboteur 
BLACK DEATH     Destroy All Enemies 
I R WINNERYou Win 


You may also start the game with the following command-line parameters:

800
Sets the screen resolution for the game to 800 x 600 pixels. 

1024
Sets the screen resolution for the game to 1024 x 768 pixels. 

1280
Sets the screen resolution for the game to 1280 x 1024 pixels. 

autompsave
This will cause the game to save every 5 (or so) minutes. 

Mfill
Fixes horizontal line display issues and black screen areas that may occur with
some video adapter configurations. 

Msync
Fixes a problem where the computer stops responding with some SoundBlaster 
AWE configurations. 

NoMusic
Turns off all music. 

NormalMouse
Replaces the custom mouse pointer with a standard mouse pointer. 

NoSound
Turns off all sounds, except those played in cinematics. 

NoStartup
Skips all cinematic sequences before the game starts. 

NoTerrainSound
Turns off all terrain sounds. 

Cheat mode (alternate):
Enter one of the following codes during game play to activate the 
corresponding cheat function. 

Code Result 
CTRL+P Build Immutable Structure  
CTRL+T Alternate Resource Menu 
CTRL+Q Quick Build 
CTRL+C View End Sequence 


More Bases Advantage
To have a better chance of winning, you might want to build more than one base. 
Enlarge the base you start out with, making it completely fortified with at 
least two castles. Then, send a scout cavalry, or some other fast moving unit, 
to the opposite side of the map from your base. After you have checked the area 
and confirmed that it is safe, send a villager to build a castle at that 
location and fortify that base. This is very helpful if your enemy knows where 
one of your bases are located, especially during online play. 

Fast Resources
Use the following trick to rapidly enter the cheat codes and get resources 
quickly. For wood, press [Enter], type lumberjack, highlight the word, then 
press [Ctrl] + C to copy it. Press [Enter] to activate the cheat. Press [Enter] 
again, then press [Ctrl] + V to paste the word on the screen for activation. 
Repeat to get resources quickly. This may be used with the rock on, robin hood,
cheese stack jimmy's, and to smithereens codes. 

Free Ally
When you build a market, there is a chance that a rival tribe will ask you to 
send them a certain amount of wood, stone, gold, and food. When they do, click 
on "Diplomacy" or press [Alt] + D and click "Ally" on the name of that tribe. 
They will become an ally free of charge. However, when you do this you will no 
longer be able to align yourself with any other tribes. This is helpful if 
there are four tribes in the game.