SteamSpy has shared its preliminary results for the best selling games on Steam in 2015. According to them, Grand Theft Auto V is the best selling game that was released this year on Steam, followed by Fallout 4 and ARK: Survival Evolved.
As we can see, there are also some surprises in this chart. Metal Gear Solid V: The Phantom Pain, one of the most optimized PC games and a game that a lot described as GOTY, was not able to hit 1 million sold copies and is barely above Call of Duty: Black Ops III. The same applies to Mad Max; a game that impressed everyone with its spectacular performance. Mad Max sold less than Batman: Arkham Knight.
The games that were able to hit the one million sales mark are: Grand Theft Auto V, Fallout 4, ARK: Survival Evolved, H1Z1, Rocket League, Cities: Skylines, Prison Architect, Besiege, The Witcher 3: Wild Hunt and Dying Light.
Do note that this graph only includes activations/purchases from April 1st to December 20th.
SteamSpy has shared more charts, so be sure to visit it in case you’re interested in sales for specific countries.