Ridge is the 44th Expert floor in Monkey Ball and Super Monkey Ball (83rd in Super Monkey Ball Deluxe), World 10-20 of Story Mode in Super Monkey Ball Deluxe, and the 233rd Ultimate stage without continues (193rd with continues).
This stage has convex parts with green and gray lines on top of them (cerulean in Super Monkey Ball Deluxe). The straight, convex parts have green lines while the curved, convex parts have gray lines. The convex structure makes it difficult to stay on the surfaces. The goal is located on the middle, convex, green-lined part on the edge. In Super Monkey Ball Deluxe, this stage is renamed Ridge and is given an 8 out of 10 difficulty rating.
To get to the goal, roll along the the convex parts by staying on the green and gray-lined sections as much as possible until you reach the goal. Be careful when maneuvering as the rigidness of the stage makes it difficult to stay on course. Make sure though not to move too slowly as there are only thirty seconds. Make sure to slow down on sharp turns as it is easy to have too much velocity.