|Appearances||vs. Phoenix Wright: Ace Attorney|
Ridelle wears a black long sleeved shirt, and a long black skirt. She also wears black shoes, round glasses, and has her purple hair tied in two pigtails. She always carries a book with her.
The team first come into contact with Ridelle Mystere in the Great Archive. At first, she is very cold towards the team after they request to see the Grand Grimoire. After solving her two puzzles, the team are allowed to see the Grand Grimoire. Mystere leads them to the first floor of the Great Archive and shows them the book.
The book had been tampered with and it seemed like there was a riddle in the defaced pages. Mystere insists that she does not know how the book became defaced due to the fact that she is the only one with the key to get into the room where it is stored and she has not let anyone else in the room except for the team.
Layton and the rest of the team solve the riddle, which opens up a basement in the Great Archive. The basement contained a mysterious mural, displaying the Great Witch Bezella with a dragon, burning down the town of Labyrinthia. Mystere was shocked to know of its existence and told the team she had no idea there was even a basement of the Great Archive.
After this shock, Mystere then assists the team by collecting puzzles that they have not come across in the chapter and stores them, so they can solve them later on. Mystere fills the role of Granny Riddleton in Professor Layton vs. Phoenix Wright: Ace Attorney.
Ridelle Mystere gives you the following puzzles in Professor Layton vs. Phoenix Wright: Ace Attorney: