Pachio-kun - Game Gallery is a Game Boy title featuring the character Pachio-kun within a 'Game Gallery' setting. This suggests that the game may have included multiple mini-games or modes, each potentially based on different types of games and possibly integrated with elements reminiscent of pachinko mechanics.  The exact nature and variety of these mini-games would need to be discovered through dedicated research.  The developer of the game was most probably a Japanese company.

Pachio-kun - Game Gallery (Japan)

Pachinko Monogatari Gaiden (Japan)