Ms. Pac Man, i never got this far but i don't think anyone did w/o cheating

Like Pac-Man, Ms. Pac-Man suffers from a bug in the fruit-drawing routine, which renders the 256th board unplayable. While it may be possible to reach the 256th board using the "rack test" cheat available as a DIP switch (usable through MAME or other arcade emulator), the actual arcade hardware will crash around the 143rd board. At this point in the game, the data tables used to determine the maze and ghost behavior for a particular level are exhausted and invalid data is loaded. Eventually, a corrupt value is loaded into the pointer to the maze data, and the game becomes unplayable. There is a black screen and the only things available on the 143rd level are the ghosts and Ms. Pac-Man. In a sense that is the final maze but you can't beat it. In essence, once you have complete the 142nd stage, you have beaten the game.