Cracked boulder

A Boulder is a large stone. In the game, it appears around the world, mostly to create obstructions and add some challenges to the game. Most boulders are spherical and appears to be cracked, and it indicates they can be removed easily with a.

Appearance
Boulders can appear in the following cases:
 * On a Resource node, to block the construction of a Miner building.
 * Covering up a Collectibles, such as Power Slug.
 * Blocking a path, usually at the biomes border.
 * Blocking the entrance to a cave.