Earthquake is the 20th stage and a bonus level for Expert in Super Monkey Ball 2.
In this stage, there is a empty floor with a goal and a switch. The floor will be tilted before the switch is activated. When the switch is activated, bananas will fall out of the sky and the floor will tilt. If you want to get the bananas, then you'll have to hurry before they fall off the stage. Or, just go straight to the goal.