It might have taken them two years, but Rainbow Six Siege is soon to be celebrating its 25th million player. For a game that was being considered dead-on-arrival at launch, that is an incredible result. It is a game with long-term ambitions, something evidenced by its seasonal content refreshes and fully backed esports scene - this is Ubisoft's first service game, and the rest of the industry could learn a lot from how its growth has been managed.

Interested in Season 4? Check out all the new Rainbow Six Siege operators.

Part of that is not resting on their laurels. Year 2 saw a major upset with the announcement of Operation Health, which put content plans on hold for an entire season, but the game is better for it with faster matchmaking, a smoother user experience, the introduction of test servers, and better in-game performance. It was a huge step to take, but it worked and the players have stuck with the game.