Middle Jam is the 21st Advanced floor in Monkey Ball and Super Monkey Ball, as well as the 39th Advanced stage in Super Monkey Ball Deluxe. It also appears as the 79th Ultimate stage with continues, and the 99th without. It is given a 5 out of 10 difficulty rating.
It begins with a small platform on which the player spawns in the center. Opposite the player (quite far away) is an equally small platform yielding the goal. Between these two platforms is a bridge made up of a rectangular outline with a beam across the middle of the long edge (like a blocky 8). On the first segment of this bridge is a convoy of bumpers that travel around the first segment clockwise. On the second segment, the bumpers travel around anti-clockwise, meaning that they all go in the same direction at the middle beam.