When the player gets to the 256th level, the right side of the maze becomes a garbled mess of code, therefore making the level impossible. The right side has some Pac-Dots too, but only 9. The right side of the screen also traps the ghosts and can make Pac Man go off the screen. The left side of the maze remains fine though. If one uses a hack to skip the level, then the game goes back to the first level. Because of this bug, a perfect game only counts the first 255 levels. This is more commonly known as a kill screen.
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Debug mode - At the main menu, press UP, C, DOWN, C, LEFT, C, RIGHT, C, start, then hold A until...