Fullmetal Alchemist and the Broken Angel

An action-RPG with the ambition to be more polished than most other licensed games. It is a side-story penned by Hiromu Arakawa herself, which got two sequels that had more elaborate graphics but less charm.

Debug Menu
Final version: After pressing Start on the title screen, an invisible option at the end of the list can be selected with X. It has a sound test, stage select, options to modify Ed and Al's experience and available special attacks, event flags, and options for the Fever and Fighting Frenzy modes.

Demo version: Pressing Start during gameplay brings out the Debug Menu.