1. Each ball represents a layer on earth.
Move the layers under the ground to the bottom row and the layers above the ground to the top row.
Air, Grass, Sand, and Water go on the top row.
Dirt, Soil, Rocks, and Slate go on the bottom row.
They can go in any order. See the screenshot if you need help.
2. Proceed to 100 Doors of Revenge Level 51!
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