Master code:
Press L, Select, A, Select, R, A, L, Select at the title screen to enable
cheat mode.
Level select:
Enable the "Master code", then press L or R to select a level. Press Left
to highlight "Start" to begin game play at the selected level.
All weapons:
Enable the "Master code", then begin game play on any level. Hold Select
and press B during game play to get 99 of each weapon.
Free movement:
Enable the "Master code", then begin game play on any level. Hold Select
and press the D-pad during game play to move in any direction.
Lakamul Rain Forest level:
Press A, L, A, R, A, L, Select(2), Start at the title screen.
Nine continues:
Quickly and repeatedly press Start at the continue screen until the
remaining number of continues increases to nine. Alternately, intentionally
lose all your lives during game play in level 1, then press B(3) at the
continue screen.
Sites: