Pachinko
The Japanese game in which many small metal balls drop through and bounce off pins arranged on a vertical playfield, falling into pockets and gates to win additional balls.
My wall mounted Mizuho pachinko machine looked great, but would frequently exhaust its ball supply during heavy play. Then I had to walk down the hall, open a closet, and transfer used balls back to the supply tray atop the game. Now a motorized pachinko ball lifter keeps that pachinko machine supplied with balls.
