Down at my old mini-golf course as a kid, they used to have a Jr. Pac-Man machine along with many others in the inside arcade area. I played a lot of it back then.
Besides a little difference in speed, I think the game was pretty much the same as the original Pac-Man. Which was okay, I think it was a tad easier for younger players. I managed to get past a good majority of levels.
But what I really liked was the story-elements in the game. Every couple of levels you'd get to see some of the life of Pac-Man, Ms. Pacman, and their son Jr.