This game has hidden developer credits.
Big Karnak is a game by Barcelona-based developer Gaelco that is basically Ghost 'n Goblins set in ancient Egypt.
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A hidden copyright along with an anti-piracy message (in Spanish) can be found at 0x300 on the main CPU:
MADE IN SPAIN BIG KARNAK GAELCO 1991 ESTE JUEGO ESTA METICULOSAMENTE PROTEGIDO: -POR LA LEY -POR SOFTWARE -POR HARDWARE
MADE IN SPAIN BIG KARNAK GAELCO 1991 THIS GAME IS METICULOUSLY PROTECTED: -BY THE LAW -BY SOFTWARE -BY HARDWARE