The following are known Action Replay Codes for Medal of Honor Underground on Sony Playstation (PS1).

The codes should work with the region specified but may work for other regions as well.

Device Compatibility: Action Replay, CodeBreaker & GameShark

Infinite Ammo
8008d4042400

Infinite Health Mission 1
800f0cea0080
800e2dda0080
800e6e2a0080
800e689a0080

Infinite Health Mission 2
800e550a0080
800d9c8a0080
800e57da0080
800e74ca0080

Infinite Health Mission 3
800ec48a0080
800dcdea0080
800f147a0080

Infinite Health Mission 4
800d71aa0080
800ddcca0080
800de6ba0080

Infinite Health Mission 5
800e48aa0080
800e190a0080
800e455a0080

Infinite Health Mission 6
800e264a0080
800fa97a0080
800e82ea0080

Infinite Health Mission 7
800dd80a0080
800dc5ea0080
800e4f9a0080
800df53a0080

Infinite Health Bonus Mission
800e860a0080
800dfbca0080
800e426a0080

Have All Mementos
80039d08ffff

Enable Cheats
80039d1000xx