Dillon, an armadillo, is a ranger charged with protecting villages from nightly invasions of walking rock monsters called Grocks. The Grocks attack the villages to feed on Scrogs, the residents' livestock. While Dillon is able to attack Grocks by rolling into them, the Grocks can sometimes outnumber Dillon. Thus, the villages have established defense towers that can be outfitted with weapons that will attack Grocks whenever they are in range. In order to improve the villages' defenses, Dillon must collect materials by exploring the landscape and defeating Grocks; the materials can then be used to build stronger weaponry for the towers.
Dillon's Rolling Western combines elements of 3D exploration, action sequences and tower defense and was first unveiled at E3 2011 as The Rolling Western.