Press enter and type: "Corwin of Amber" and press enter again. Now press enter and type any code below, followed by an enter.

IRON FORGE = Upgrades all technologies immediately.
LEVEL NAME = Takes player to the requested level (i.e. ORC12). This cheat works only in Campaign Mode.
EYE OF NEWT = Upgrades your magic users with all spells.
POT OF GOLD = Adds 10,000 gold and 5,000 lumber to your reserves.
YOURS TRULY = Takes player to the victory sequence. This cheat works only in Campaign Mode.
SALLY SHEARS = Displays the entire map area.
HURRY UP GUYS = All buildings, units and upgrades are built/trained at an accelerated rate.
IDES OF MARCH = Takes player to the finale sequence for the campaign the player is currently in.
CRUSHING DEFEAT = Takes player to the loss sequence. This cheat works only in Campaign Mode.
THERE CAN BE ONLY ONE = All of your units are invulnerable except by a direct catapult hit, and will inflict 255 points of damage per hit.

Note: In a Two-Player game, these codes will affect both sides