This game appears to be part of a series of Pachislot (slot machine) themed games. 'Pachislot Adventure' suggests an adventure game incorporating the elements and excitement of Pachinko slot machines. The Japanese title provides further detail about the specific setting or characters within the game.  The Japanese market's interest in Pachinko likely drove the creation of such games.

Pachi-Slot Adventure 2 - Sorotta Kun no Pachi Slot Tanteidan (Japan)

Pac-Mania (USA) (Unl)