During game play in Single Player mode, press Enter to get the message box, type the cheat code you want, and press Enter again to activate it.

black sheep wall Reveal Entire Map
breathe deep 500 Vespene Gas
food for thought No Supply Limit
game over man Instant Loss
medieval man All Research Abilities
modify the phase variance Build Anything
noglues Enemy has no Energy for Spells/Abilities
operation cwal Faster Building and Instant Upgrades
ophelia Enable Mission Select (Note: Must be enabled before using the other Mission Select codes)
power overwhelming Invincibility
protoss [mission #] Protoss Mission Select
radio free zerg Plays the secret Zerg theme song (Note: Play as Zerg)
show me the money 10,000 Minerals and Gas
something for nothing Free Upgrades
staying alive Continue Playing After Win
terran [mission #] Terran Mission Select
the gathering Infinite Energy for Spells/Abilities
there is no cow level Instant Win
war aint what it used to be No Fog of War
whats mine is mine 500 Minerals
zerg [mission #] Zerg Mission Select