Assassin's Creed 4: Black Flag shipped 10 million copies as of December 31, 2013, Ubisoft has announced.

"Assassin's Creed 4 Black Flag performed particularly well, reinforcing the franchise's long-term potential and therefore its upcoming iteration," said Ubisoft CEO Yves Guillemot in a prepared statement. "This robust showing was achieved thanks to the excellence of our teams, our extensive development capacities and the efficiency of our Lead and Associate studio structure."

Assassin's Creed 3 shipped 12 million units in the same time frame the previous year, but Guillemot added that AC4 sales have been stronger in the first six weeks of 2014.

In the conference call which followed, Guillemot added: "We expect to reach around 11 million by the end of March, a remarkable performance close to the high end of our plan."

He continued: "Pricing was very strong, almost on par with last year's level. We are extremely proud of this achievement notably in the face of a challenging environment and an exceptionally competitive context."

Source: Ubisoft financial results, CVG