Yakuman is a Japanese mahjong game released for the Nintendo Game Boy. Mahjong is a tile-based game incredibly popular in Japan and East Asia, and this version brings the experience to the handheld console. The gameplay involves strategic tile matching and scoring; mastering the various yaku (winning hands) is central to the game.  While gameplay specifics are difficult to find without access to the game itself, it likely offered a traditional mahjong experience tailored for the Game Boy's hardware. The developer and publisher information isn't commonly available for many Japanese Game Boy releases of this era.

Yakuman (Japan)

Xenon 2 - Megablast (Japan)