A lawsuit has been filed from Bethesda against Warner Bros. that alleges the recently released Westworld mobile game infringes upon the copyright for Fallout Shelter.

See, Westworld was developed by Behaviour Interactive, who are also being sued by Bethesda. Behavior Interactive was a co-developer on Fallout Shelter. Bethesda's lawsuit claims that the Westworld game, released this week for Android and iOS, "has the same or highly similar game design, art style, animations, features, and other gameplay elements" from Fallout Shelter.
The Westworld game is a blatant rip-off of FALLOUT SHELTER. Working with the same copyrighted computer code used by FALLOUT SHELTER, Westworld has the same or highly similar game design, art style, animations, features and other gameplay elements as FALLOUT SHELTER, all of which are owned by Bethesda.

The lawsuit continues on to say that Behaviour Interactive has used the "same copyrighted computer code created for Fallout Shelter in Westworld" and that they "copied Fallout Shelter's features and then made cosmetic modifications for Westworld's 'western' theme."

Other points of contention include the use of "cartoonish 2D characters in a 3D environment" and the fact that Westworld also has players building a multi-room facility underground, just like Fallout Shelter.

The full lawsuit can be found at Scribd courtesy of Polygon.