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.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art / Original