Tunnel B1 Cheats
PS1 | Submitted by Oliver KongUnlimited Weapons
Complete the game once and save the data with the yellow word, "Orpheus". Load that data and you'll begin the game with all weapons with unlimited ammo.
PS1 | Submitted by GamesRadarFull Health and all Weapons (PAL Version Only)
To get all weapons and full health, while playing the game press L1,R1,L2,R2,square,circle,triangle,and X at the same time.