Fushigi no Dungeon: Fuurai no Shiren 2: Oni Shuurai! Shiren-jou!

One of the Japan-only Mystery Dungeon roguelike games, that would eventually get more success after a change of the cast from young samurais to monsters.

Debug Menu and Map
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A debug map, reusing the map of a regular shop yet considered by the game as a dungeon, was left in this game. It is oddly filled with treasure chests. An exit to the right brings you back to the regular shop. It seems also that there is an NPC that can change your gold amount.

The debug menu, however, enables more options: Max HP/Gold/Level, Instant Warp (albeit buggy), replaces your PC model with another (à la Sonic Debug Mode), Flag editor, battle test, sound test...