A lazy version of Pac-Man
The gameplay is the same basic rules of the arcade Pac-Man; run around eating all the pills and avoiding ghosts. Super pills turn all the enemies blue and allows you to eat the ghosts, which then go back to the center of the map. Vitamins (found around the center of the map) give you extra points. Tunnels get you to the to of the map if you go through the bottom tunnel and vice versa.
The difference in gameplay is that the map is now placed in a horizontally based map, as opposed to other ports, which has vertically shaped maps. However, tunnels are at the bottom of the map. Pills are now rectangular shaped and super pills are now square shaped. Fruits are replaced with vitamins.
The sound is bad. The intro music, as opposed to other ports that has a catchy tune, is now a screechy 4-note jingle. The wakka-wakka in the arcade version is replace with a harsh "dun-dun". All the sounds from teh arcade verison have been swapped with severely inferior sounds.
The graphics aren't that good. Pac-Man's head doesn't rotate when moving up, instead having the same sprite facing left and right. The ghosts flicker a lot which can strain your eye.
Overall, this is a lazy, unfaithful version of Pac-Man and Atari should of done better. Get another port of Pac-Man or, if you still want a Pac-Man for the 2600, get Ms. Pac-Man.