Grousley is a passenger on the Molentary Express, appearing in Professor Layton and the Diabolical Box. He does not let Professor Layton pass if he does not complete over 12 puzzle early on in the game and gives the team 'Clouds and Sky' to solve.
Grousley wears a blue suit with matching trousers and top hat. He also wears a white shirt with red bracers and navy shoes.
Grousley gives the following puzzles in Professor Layton and the Diabolical Box:
"Grousley is one of the many passengers on the Molentary Express. While he may not look the part, the eccentric Grousley is actually a very well-to-do artist and friend of Beluga's. He gets inspiration from the natural scenery visible on train rides."