Here is a hack for Pac-Man which changes all the level layouts in this arcade classic.
Pac-Man (USA) (Namco).nes - NOINTRO
CRC32: 15D202D8
MD5: 3DDCA58C51DD38D59F9271D24E7105F9
SHA-1: E7D818E128593109B5C480497A050FACC0744F1B
SHA-256: 254FB93E16D0DB63B36FFA3EF1BC5A9E6CF9E9B1DE347712D9936FE2AB7B690D