Air Hockey is the 50th and final Expert stage in Super Monkey Ball 2, and the 99th Expert stage in Super Monkey Ball Deluxe. It also appears as the 209th Ultimate stage with continues, and the 249th without.
There are four walls that hit the cube with the goal inside it. The walls move on the dark lines of the stage.
On the platform, get to the path where the cube is moving, but be careful when trying to reach the goal as you can often get knocked out instead of reaching it.
Chase the goal. And whenever you think it will pass you somewhere, just stand still in that place and the goal will knock into you.
With pause buffering, this stage is easier to clear than it would be normally. As soon as the level starts, hold up on the control stick. Keep going with the direction held, and release the stick in neutral position at the exact frame you touch the main platform, which is between 59:35 to 59:37.