How do you complete level 9 on 100 Floors?

Answer 1

You match the rings with the bolts. Look carefully at the bolts, there is an inside and outside color... dark or light.

If the bolt in the corresponding color is dark on the inside and dark on the outside, then tap the ring on the door until it looks the same as the bolt.

Do this with all four bolt-ring combinations, and the doors will open.

Just in case it is hard to tell:

Upper left bolt is Dark-inside, Dark outside

Upper right is Light-inside, Light outside

Lower left is Light-inside, Dark outside

Lower Right is Dark-inside, Light outside.