Chalvo 55 - Super Puzzle Action [Model DMG-A2SJ-JPN]

29 Years old Nintendo Game Boy Cart. Japan System Supply

TIPS AND TRICKS

Sound test:
Start a new game, at the last scene of the intro with mechanic and its robot, press Up, Up, Right, Right, Down, Down, Left, Left.

Secret passwords:
SPCLST - Start a Special Stage 9 with 50 lives.
JSSJSS - Start with 50 lives.

SOURCES

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ROM dump (MAME).