| | Date | System | Released by | File release date | Retail release date |
|---|
| Arkanoid II (Nov 11, 1987 prototype) | | MSX2 | Video Game History Foundation | | JP Dec 1987
|
| Arkanoid II (prototype B) | | NES | Video Game History Foundation | | JP Mar 8, 1988
|
| Bakushou!! Jinsei Gekijou (Early prototype) | | NES | Video Game History Foundation | | JP Mar 17, 1989
|
| Bakushou!! Jinsei Gekijou (Oct 13, 1988 prototype) | | NES | Video Game History Foundation | | JP Mar 17, 1989
|
| Kyuukyoku Harikiri Stadium (Prototype) | | NES | Video Game History Foundation | | JP Jun 28, 1988
|
| Takeshi no Sengoku Fuuunji (Jun 4, 1988 prototype) | | NES | Video Game History Foundation | | JP Nov 25, 1988
|
| Unknown (NES CHR prototype) | | NES | Video Game History Foundation | | |