In under 25 minutes beat Zerg level 9 'The Reckoning' to access it.

During game play press 'Enter' to bring up the message box then type in the code for corresponding effect.

Enable Mission Select:
Ophelia

Infinite Energy:
The gathering

Instant Loss:
Game over man

Instant Win:
There is no cow level

Invincibility:
Power overwhelming

No Supply Limit:
Food for thought

Unlock Faster Building:
Operation cwal

Play Secret Zerg Song:
Radio free zerg

Opponent has No Psionics:
Noglues

Unlock 10,000 Minerals and Gas:
Show me the money

Remove Fog of War:
War aint what it used to be

Unlock 500 Gas:
Breathe deep

Unlock 500 Minerals:
Whats mine is mine

Build Anything:
Modify the phase variance

Reveal Entire Map:
Black sheep wall

Free Unit Spells/Abilities:
The gathering

Keep Playing After Mission End:
Staying alive

Unlock ALL Research Abilities:
Medieval man

One Level Unit Attack and Defense Upgrade:
Something for nothing