Level select
At the main menu, hold Z and press C-Up, C-Right, C-Down, C-Left, Start.

Infinite ammunition
At the main menu, hold Z and press L, R, L, R.

Infinite armor
At the main menu, hold Z and press Up, Right, Down, Left.

Free buildings
At the main menu, hold Z and press A, B, A, B.

Free satellite
At the main menu, hold Z and press B, C-Left, C-Down, A.

Faster tanks
At the main menu, hold R + Z and press C-Up. If you entered the code correctly, you will hear a sound.