I don't know if it's forbidden, but personally I get a kick out of the hack releases. I love the character portraits in SVC Chaos PLUS/Super plus, convenience of all characters in the KOF 2003 Hack (Kof2004 super something), playing as Orochi in the KOF 97 hack, etc.
Any others worth mentioning that were released in physical format on bootleg PCBs?
Any others worth mentioning that were released in physical format on bootleg PCBs?