Getsu Fuuma Den

Leftover cheat
There is a leftover cheat in the game's coding that gives you all inventory items by setting memory addresses and  to  when the A button is held while pressing Start to start a new game. However, the game's initialization routine sets both addresses to after the cheat is applied, rendering the cheat nonfunctional. It is likely a leftover from development.

The Game Genie code will re-enable this cheat.

Debug mode
Game Genie code enables a debug mode. On the world map, press A + B + Select for a free-movement mode. Hold Up + A + B and press Select to cycle through the game's modes.