1. Pick up the red ball. Select it from your inventory and place it into the hole above the ring. Tilt your phone/device to the left (about 5 seconds) until you hear a sound.
2. Now pull the ring down to see letters and numbers.
Find the numbers that spell DOOR.
D = 6
O = 9
R = 11
so DOOR = 69911
Press the keypad and enter 69911.