Sandbox

The Sandbox is a vehicle creator in Bad Piggies, where the player can build with every object in the game. To unlock most of the levels, the player must clear ⅓ or ⅔ of an episode's default levels. One episode is unlocked by collecting ten hidden skulls throughout the game.

Each level has twenty star boxes to collect. However, the main purpose of the Sandbox levels is for the player to control their creation to their heart's content, thus the star boxes won't reappear after they are collected.