Spy Hunter/Moon Patrol Infinite lives
At the game selection screen, press Up, Down, Left, Right, Up, Down, Left, Right, Up, Left, Down, A. If you entered the code correctly, you will hear a sound.
Infinite weapons
At the game selection screen, press Up, Down, Left, Right, Up, Down, Left, Right, Up, Left, Down B. If you entered the code correctly, you will hear a sound.