Just for a bit of fun, here are the top ten best-selling games in the US from 2012. This is based on data from retail analyst NPD Group, drawn from sales of physical goods rather than digital downloads. According to the company's annual report, game sales were down 23% from 2011.

Here's the line up:

1. Call of Duty: Black Ops 2 (Xbox 360, PS3, PC, Wii U)
2. Madden NFL 13 (Xbox 360, PS3, Wii, Vita, Wii U)
3. Halo 4 (Xbox 360)
4. Assassin's Creed 3 (Xbox 360, PS3, PC, Wii U)
5. Just Dance 4 (Xbox 360, Wii, Wii U, PS3)
6. NBA 2K13 (Xbox 360, PS3, Wii, PSP, Wii U, PC)
7. Borderlands 2 (Xbox 360, PS3, PC)
8. Call of Duty: Modern Warfare 3 (Xbox 360, PS3, Wii, PC)
9. Lego Batman 2: DC Super Heroes (Wii, Xbox 360, NDS, PS3, 3DS, Vita, PC)
10. FIFA 13 (Xbox 360, PS3, Wii, Vita, 3DS, Wii U, PSP)

Read more here: http://www.guardian.co.uk/technology/gamesblog/2013/jan/11/us-top-10-games-2012
 
So this list only counts disk sales not downloads. I'm surprised that Battlefield 3 was not on the list but I wonder if that is because most of the sale came in 2011 or came as downloads.

GOA.Luke*BK*

I imagine PC BF3 sales were largest in November 2011, and sales were predominantly digital (including pre-orders for the free Back to Karkand expansion).
Even when BF3 launched, it was not #1.  Call of Duty is king of sales.

November 2011

1.Call of Duty: Modern Warfare 3 (360, PS3, WII, PC)** Activision Blizzard ~9 million
2.Elder Scrolls V: Skyrim (360, PS3, PC)** Bethesda Softworks
3.Battlefield 3 (360, PS3, PC)** Electronic Arts
4.Assassin's Creed: Revelations (360, PS3, PC) Ubisoft
5.Just Dance 3 (Wii, 360) Ubisoft
6.Madden NFL 12 (360, PS3, Wii, PSP, PS2)** Electronic Arts

I would be interested in seeing the top digitally distributed games myself. The most played games on steam appear to be DotA 2, Football Manager 2013, and Counterstrike. Source: http://store.steampowered.com/stats/

No Far Cry 3?