21 promises to be the most comprehensive game in the series yet in terms of the amount of officially licensed buses that are available for you to play with, by well-known manufacturers as well such as newcomers to the franchise Volvo, Alexander Dennis, Scania, BYD, Grande West, and Blue Bird as well as brands that have been with Bus Simulator before Mercedes-Benz, Setra, IVECO BUS, and MAN. Bus Simulator 21 is an automobile simulation game, the sixth iteration of the much-beloved bus simulator franchise developed by stillalive an Austrian game development studio.