Enter the following at the password (Load Game) screen:
Wolf's Fang Peak: PRLD, GAZE, MEDI, HAXE, PATH, BONE, TREE, LINK
Angkor Wat: KURZ, HELL, WEFX, MEMO, HEAR, FITZ, ELRC, CLIK, MGSL
Laconia Island: ROMA, MONK, AEON, TIME, OLIM, LAND, DART
Teg-Du-Bhorez Headquarters: HILL, CHEX, STLK, MECH, ARKD, MUSH, SPOK, LITH
All weapons cheat: up, left, a, a, b, b, b, right, left, a, a, a, a, a, b, b, b, b, b, b, b, b, b, left, right, right, left, left.