Also battling for a spot on the list were newcomers Dead Space 2 (released January 25) and LittleBigPlanet 2 (released January 18), coming in at third and fourth place, respectively. DC Universe Online also inched onto the list in tenth place. The month's best-selling title was Call of Duty: Black Ops, which launched in November 2010, across five platforms.

At the time of this publishing, Microsoft was the only company to share hardware sales data. According to a press release (sourced by the NPD Group, which shares numbers with companies but not the press and public), Microsoft says its Xbox 360 sold 381,000 units in January, up 48,000 units from the same period last year. This, Microsoft says, places the Xbox 360 as "the leading game console in 2011." Sony has not revealed hardware numbers but offered that its PS3 software sales were up 25 per cent year-over-year.

The complete top ten list from the NPD Group can be found after the break.

Top Ten U.S. Retail Titles (All Platforms) - Reporting period 01/02/11 - 01/29/11
1. Call of Duty: Black Ops (X360, PS3, Wii, NDS, PC)
2. Just Dance 2 (Wii)
3. Dead Space 2 (X360, PS3, PC)
4. LittleBigPlanet 2(PS3)
5. Zumba Fitness: Join the Party (Wii, 360, PS3)
6. NBA 2K11 (X360, PS3, PSP, Wii, PS2, PC)
7. Assassin's Creed: Brotherhood (X360, PS3)
8. Dance Central (X360)
9. Michael Jackson: The Experience (Wii, DS, PSP)
10. DC Universe Online (PS3, PC)

Note: The NPD Group no longer lists software as individual platforms. Sales for all platforms will now be combined when listed in the "Top Ten" and no figures will be released to the public from the NPD Group. Listing counts new physical retail sales only.)

The NPD Group did not include any additional analysis for the month.