The other day I spent a little time working on enforcing some rules for the games so that you don’t accidentally create a maze that won’t run.

• Ms Pac-man – has 4 levels all 31 cells tall by 29 wide. You can have horizontal tunnels, but not vertical.
  
• Pac-man – Originally based on the Ms. Pac-man code it has 2 levels (get to the second one by using the player select switch) 31 cells tall by 29 wide. You can have horizontal tunnels, but not vertical.
  
• Ms Pac-man (Bob’s Arcade Hack) – Like the original it has 4 levels, but has a height of 32 width of 29. The extra row was added to make it match the original arcade. You can have horizontal tunnels, but not vertical.
  
• Pac-man Collection – Contains 21 mazes (356 bytes a piece!). Like the Ms. Pac-man hack these match the arcade with a height of 32 and width of 29. You can have horizontal tunnels, but not vertical except on level 10 which has special logic to handle a vertical tunnel.
  
• Jr. Pac-man – Contains 8 mazes. 7 from the original Jr. Pac-man and a bonus (Easter egg?) level based on the Xbox Pac-man game (forget the name). These are all 32 cells tall by 56 wide. Jr. does support vertical tunnels, because it is required in the bonus level, but alas does not support horizontal tunnels.
  

Because of these limitations I’ve enforced making changes to the boarder of the game.