Dooors Zero Level 18 Guide:
Go to wall with wooden boxes. Shake phone until they fall over. Press button and listen carefully.
Go to wall with 6 buttons and press them in correct order by sound:
top left, bottom left, top middle, bottom middle, top right, bottom right
Open main door and press blue lever.
Tap sound button again and remember new tune. Tap buttons again:
bottom right, bottom middle, bottom left, top right, top middle, top left
Open the door.
Proceed to the next level!
Dooors Zero Level 18 Guide