Harley's Humongous Adventure

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Level Select#

At the title screen, quickly press X, A, Y, B, R, Select, L, Up, Down, Left, Right.

(Source: GameFAQs (Mezmorize99))

0x691A

CHEAT ON @CHEAT OFF

Located at 0x2DF5B is error text, which may appear onscreen if the game crashes during gameplay.

ERROR NUMBER @H"........FATAL ERROR:

There is a single unused song that can be heard in-game via PAR code 7E370B03.

(Source: nensondubois)