Hal also did a superior version of Pac-Man on the Vic-20 in comparison to AtariSoft's attempt. It was called "Jelly Monsters". Also, for the GB, GBC, and GG ports of the game, there is a Full-Screen option like the NGPC had. You just had to press left or right. They also had a sort of battle mode via link cable, where it was either first to lose all their lives lost, or whoever beat the set number of stages first won. Also, if one player eats a ghost, it gets sent to the other's playfield.
If you ever get have a chance, Mark, you should give Opcode's "Pac-Man Collection" a shot on the ColecoVision. For the hardware it was made for, it's pretty much arcade-perfect.