Cheat menu:
To unlock Cheat Mode, pause the game and press R, R, L, R, L, L, R, L, R, R, L, R, L, L, R, L. Now, a number of Cheats will be available from the Options menu including:

Cheat Win
Clear Fog of War
Enable All Levels
Gives $10,000
Makes player Invulnerable
Toggle Unit Spying