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]x2, [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]x3 at the continue screen.