Zombie Zone Cheat mode
At the “Press Start” screen, quickly press Up, Down, Up, Down, L1, R1, L2, R2, L3, R3, Up, Down, Up, Down, L1, R1, L2, R2, L3, R3 to unlock all bonuses.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art / Original