Pause the game and hit X, DOWN, DOWN, UP, LEFT, RIGHT.
Get $10,000
After pausing the game press START then press X, Left, right, Up, Left. A message will confirm correct code entry.
Get 100 Population
After pausing the game press START then press X, Right, Right, Left, Up. A message will confirm correct code entry.
Invincible Units
Enter RIGHT, LEFT, RIGHT, RIGHT, X.
Mission 4: Releasing Hooper from prison
Get one of your commandos into the prison. The prison will explode, and your commander will still be standing there. Take him to the northeast village and avoid the GHOST troops.
Replay Missions
After pausing the game press START then press X, Up, Up, Left, Right, Left.
Skip Mission
After pausing the game press START then press X, Up, Up, Left, Right, Left. Now end the game and press X at the debrief screen.
To Attack Faster
Build structures that make units (Barracks, V. Factories, etc.), then have each of them to make units. For example, if you made two Barracks and told one to make fifteen soldiers and the other to make fifteen soldiers, both barracks will make them. This works for both IPC and GHOST. This trick will allow you to make soldiers and attack a lot faster.
View All On Map
To view all on your map pause the game and press: X, LEFT, RIGHT, RIGHT, LEFT.