One of several films delayed by Fox.
Also Stealth Inc, New Little King's Story and Urban Trial Freestyle.
The PS3 exclusive becomes the first title of 2013 to hold the No.1 spot for four consecutive weeks.
"We want to be prudent on our expectations," says Ubisoft boss as Assassin's Creed 3 ships 12.5 million.
Available today for Xbox 360, tomorrow on PC and PS3, says Ubisoft.
Also pre-order BioShock Infinite ahead of its March 26 release.
Closely followed by FIFA 13.
Mistakes the screen shot for a picture of the Damascus skyline.
Unannounced Assassin's Creed game in the works at Ubisoft Montreal, Annecy and Bucharest, LinkedIn profiles reveal.
Second highest launch week for an Aliens game, only bettered by 2010's AVP.
Fixes up some remaining single and multiplayer issues, plus preps game for Tyranny of King Washington DLC.