What is rarest game you have played?

[Simulacrum]

My would be

Kingsley's Adventure for ps1

 

I bought this game as a kid because it had Finnish sub (it was AMAZING to understand something about the game story back then)

I really liked this but found out no1 knows about it.Not even vgchartz!

Well maybe even rarer would be Blues brothers for amiga.IT HAD CO-OP WHICH WAS AMAZING BACK THEN!