Chachamaru Boukenki 3 - Abyss no Tou [Model DMG-A3J]

Ending:
At the title screen, press B, Select, Up, Up, Select, Down, Down, A.

Ingame cheat sequences:
During the game, press Select to open the floor number information window, then enter one of these codes. All codes may be combined and can be used multiple times.
Up, Down, Start, Right, Start, Right, Left, A - Monster viewer.
Up, Start, Right, Down, Left, Start, Down, A - Sound test.
Up, Down, Left, Right, Start, Right, Down, A - Max level, 34000 exp.
Up, Right, Right, Left, Start, Start, Left, A - Super Equipment.
Up, Left, Down, Start, Left, Start, Right, A - Unlimited food.

Game genie:
3D4?DAE?F73 - Replaces the ingame cheat for Unlimited food with the Free walk mode toggle. Enter corresponding cheat once to enable it, then one more time to disable.