OK (Mid-level) is a performance rating in the Rhythm Heaven series, depicting that the player did an average job clearing the game. This rank is required to pass a stage.This rank is provided as an in-between for the "Try Again" and "Superb" rating. This rank is normally recieved during ordinary play, or after the player has practiced a bit.
The OK rank has a subsidiary called "Just OK," which is midway between "OK" and "Superb." The player recieves aJust OK rank when they have fulfilled one or two Superb requirements, but not all three. This rank counts as OK for all purposes.