You can find the Hidden Skull 20 on When Pigs Fly Bonus Level 2-VII. To beat the level start with 3 metal frames with a piggy in the one on the left. To the right add a small propeller and to the left add a blue rocket. Underneath this layer you add small castor wheel under the pig and a large metal wheel on the right. Finish it off with large propeller on the top and a deluxe motor in the frame on the right.

Bad Piggies
Skull 20 Location
Find The Skulls 20
When Pigs Fly 2-VII
Level 2-VII

Hidden Skull Location
Bad Piggies Walkthrough
Bad Piggies Cheats

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Skull 19 Walkthrough