The graphics in Jr. Pac-Man are great, and all of the insane gameplay from the arcade version is here... with the option to rid yourself of some of the pesky ghosts. This gives you the chance to lessen the challenge to see further in the game if you want to, and gives Jr. the largest variety of different skills out of the entire Pac-Man series.
The only difference from the arcade game is that the mazes have basically been tilted on their side. The 2600 version of Jr. has mazes that scroll up and down, while the arcade version scrolls left to right. The difference is noticeable but does not seem to affect gameplay at all. In fact, the mazes are accurate representations of their arcade counterparts.
Even the smallest details have made it into this game, from the different noises when picking up the pellets that the toys have run over to the explosion that occurs and wipes out a power pill if you are too late in grabbing a toy. This game is pretty easy to find, and you should be able to snag yourself a copy for under $10.00. Make sure that you do -- you won't regret it!