Frontier Developments, the maker of Planet Coaster and Elite Dangerous, is suing Atari, the company behind RollerCoaster Tycoon World.
Atari has put its video game assets up for sale, and they include some standout franchises.
5/10 shooter Medal of Honor: Warfighter has topped the UK all-formats chart - but sold less than its predecessor, the 2010 Medal of Honor reboot.
Rollercoaster Tycoon 3D will finally arrive for 3DS on 26th October, publisher Namco Bandai has announced.
The game will feature a new campaign mode, Coaster Story, which blends tutorials and challenges with a story and unlockables.
Rollercoaster Tycoon's PC controls have been transferred to the 3DS touchscreen, and you can use the gyro sensor to tilt your view.
Atari has popped its official stamp on Rollercoaster Tycoon 3D.
A Rollercoaster Tycoon game for Nintendo 3DS is in development.