Eating a Ghost sends a Jammer Pac-Man to other players. Jammer Pac-man slows you down.
The face buttons select which effect Power Pellets have. Select Power-Up , then activate eating a Power Pellet. Stronger sends more Jammer Pac-Mans per ghost, but Power Pellet active time is reduced. Train adds more ghosts to ghost trains, but you get extra Jammer Pac-Man in your own maze. Speed doubles movement speed, but you send less jammers.
Fruits are summoned by eating half of the dots in a maze. Eating fruit reset the maze and kills Red Jammers.
I played a few games of this awesome and intense Battle Royale-style Pac-Man game, free for the Switch.