Solenoids are widely used in slot machines and its related machine & equipment.
For example, Solenoids to distribute coins to each slot machines, solenoids to prevent from receiving coins more than default quantities installed into slot machines, solenoids to prevent from putting coins during a power failure just like shutters.
And also solenoids are used for an opening/closing part built in pachinko (Japanese gambling machines) and a part to push out pachinko balls.
Solenoids are used in arcade game machines. It is because solenoids is more convenient than motors for Liner motion.