Nazo-Oh is an Adventure game, developed by Bandai Visual and published by Bandai, which was released in Japan in 1996.

Nazo-Oh is a quiz game in which the player takes the role of a young boy that wakes up in a bizarre fantasy world and suddenly a strange creature talks to him and tell him that he got to go to the citadel that is near where they are and enter there to solve the different riddles that the citadel citizens will ask him.