Entering the room that contains the Golden Torizo in Ridley's Lair while holding down the face buttons on the controller will trigger a secret debug code. There is a catch, however: once you let go of the fire button, the game will freeze due to two of the beams being incompatible, but being forcibly enabled by the code. As such, you can enter this room while in Morph Ball mode to avoid freezing the game or just be lucky on how you let go of the fire button.

This will reset your inventory to 700 Energy, 300 Reserve Energy, 100 Missiles, 20 Super Missiles, 20 Power Bombs, all beams equipped (remember to disable at least one of the bottom two), and all items except Screw Attack, which is obtained after fighting the Golden Torizo.