The clue is on the elevator door.
Tilt the device to move the balls.
- First: both balls at the bottom.
- Second: both balls at the top.
- Third: Only the left ball on top. You must put the right ball into the hole.
- Fourth: Only the right ball at the bottom. Get rid of the ball in the hole. Tilt the device so it reaches the button below.
Elevator opens. Welcome to level 30.