SD Hiryuu no Ken Gaiden, a Japanese Game Boy title, is a spin-off from the popular "SD Hiryuu no Ken" franchise. While details on its precise gameplay mechanics are scarce due to its regional release and lack of widespread English documentation, it likely involves the side-scrolling action and RPG elements common in other games of the era.  Its pixel art style likely showcases the distinctive chibi-style character designs typical of the SD Hiryuu series.  The game was published by a Japanese company but which exact publisher requires further research.

SD Hiryuu no Ken Gaiden (Japan)

Scotland Yard (Japan)