Ninja Ryuukenden - Matenrou Kessen is a Japanese Nintendo Game Boy title. Given the title and genre, it likely featured action platforming gameplay centered on a ninja protagonist.  Players probably controlled a ninja character, battling enemies using ninja skills and techniques.  The specifics of gameplay mechanics require further investigation to determine the exact features of the game and further research to identify its developer or publisher.

Ninja Ryuukenden - Matenrou Kessen (Japan)

Ninja Boy (USA, Europe)