Skull

A skull is a collectible item in Bad Piggies. They appear as the skulls of the Minion Pigs, Corporal Pig, and the Foreman Pig. So far, there are 45 skulls in the Tusk 'til Dawn update. Skulls are the remains of deceased pigs, and sparkle when seen.

Usage
The skull acts like a Star Box and a dessert. They are collectible but are rare and hard to find and get.

After obtaining 10 skulls you can unlock the Find the Skulls Sandbox.

Currently, their use is to unlock the "Find the Skulls" Sandbox level and for iOS/Android users only.

Skulls are also found as a custom part for the Egg, which has 1 star and can be obtained by the same way as the other, in the Crates and Scrap Machine.

Skull Locations
This walkthrough will help you find the skulls by showing which levels they are in.
 * 1) Ground Hog Day 1-6
 * 2) Ground Hog Day 1-9
 * 3) Ground Hog Day 1-21
 * 4) Ground Hog Day 1-23
 * 5) Ground Hog Day 1-25
 * 6) Ground Hog Day 1-27
 * 7) Ground Hog Day 1-II
 * 8) Ground Hog Day 1-III
 * 9) Ground Hog Day 1-IV
 * 10) Ground Hog Day 1-VII
 * 11) Rise and Swine 2-10
 * 12) Rise and Swine 2-11
 * 13) Rise and Swine 2-18
 * 14) Rise and Swine 2-19
 * 15) Rise and Swine 2-20
 * 16) Rise and Swine 2-21
 * 17) Rise and Swine 2-29
 * 18) Rise and Swine 2-31
 * 19) Rise and Swine 2-35
 * 20) Rise and Shine 2-IV
 * 21) When Pigs Fly 3-4

Trivia

 * Skulls also appear in Piggy Tales. They appear in Dr. Pork, M.D and Hiccups.
 * Oddly, the Foreman Pig's skull still has his mustache on it.
 * It is revealed that skulls can carry hiccups in the Piggy Tales episode Hiccups.
 * In Bad Piggies, The skulls have no ears and tails. In Piggy Tales, however, they have ears and tails.
 * Skulls also appear in Angry Birds Epic and many other instances.