Ubisoft said sales at that level represented "very good performance." By comparison, 2013's Assassin's Creed IV: Black Flag alone shipped 10 million copies by the same point in time.
However, Unity launched exclusively for Xbox One,PlayStation 4, and PC, while Rogue was released forPlayStation 3 and Xbox 360. A PC version of the game is coming next month.
Black Flag, on the other hand, was released across console generations.
This year's Assassin's Creed game is rumored to be Assassin's Creed Victory for current-generation platforms and PC; it is reportedly set in Victorian-era London.