Level 20 was difficult, it took me twenty minutes to complete. Follow the screenshots strictly to complete this level.
Tap on the floor on the right side of the door and pick the underwater goggles.
Select the goggles from item column and tap on the water.
Use the brush to clear the dirt which reveals a fish bone.
Adjust the water lever matching the fish bone length. Tap on the door and move to next level.
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