Ooparts is the third Master Extra stage from Super Monkey Ball 2's and Super Monkey Ball Deluxe's challenge modes.
Ooparts involves a platform leading to a large rotating object that looks like a hollow sphere with large sections of it cut out. This object rotates towards the start platform at a quick speed, and there are no buttons to slow it, pause it or anything like that. It's incredibly hard to understand how to do it at first glimpse, but the strategy for it isn't too hard - although it will need some practice, as with all Master stages. When this stage makes you extremely mad, just remember it strangely resembles a diaper.
There is one goal in this stage - the blue goal. It's located on a platform on the other side of the rotating object. A strategy that works pretty well is to simply go towards the thing as the stage starts, lose almost all your momentum by the start of the 56th second, and then fall in the middle of the 55th. Once you do that, ramp along the side that you chose and fall off near the thin middle, and fly off it, aiming for the platform. You want to make sure you don't keep too much speed when you fall off so that you don't go off the small platform where the goal is.
Another strategy that uses pause buffering works like this. First, do nothing at the start of the stage until the timer gets between 55:29-55:33 to hold up on your analog stick and unpause, you will notice that you will bump into one of the parts of the moving object that will send you flying to the goal platform, quickly hold backwards and then adjust your momentum when you land so you do not overshoot and fall of the goal platform. This is pretty easy to do and should only require a few tries, if you do not get it at the first try (I actually discovered it myself without any sort of practice until I got the correct timing). Hope this works for you guys.