In 1997, a group of Japanese developers began creating a game called Magic Castle. The creators spent eight months developing a prototype of the project, which was sent to seven major publishers, including Sony. The game was not fated to see the light of day, and development of Magic Castle ceased in 1998.
Recently, one of the creators of the Magic Castle prototype under the nickname PIROWO discovered the project's source code, decided to polish some aspects, and uploaded the game online for free download.
It is worth noting that this is not a fully finished product, but Magic Castle is playable in its current state.
You can download Magic Castle here. The game manual is available here.