Centrifugal is the 1st Master stage in Challenge Mode of Super Monkey ball 2.
A large bowl-shaped centrifuge with a hole in the center spins rapidly in a counterclockwise direction. Single bananas circle the steepest section of the centrifuge. The goal is located next to one of the bananas.
There is only one goal, the blue goal. Roll into the centrifuge and balance the ball near the bananas. Pull back on the control stick to counteract the spinning motion so that you can get closer to the goal. The mini map is very helpful in this stage. Slow down as you get near the goal because once you overshoot it, it is impossible to move forward towards it without climbing up the side and falling off. You have to pull back again until the goal circles around.