Sales of the PlayStation 3 exclusive LittleBigPlanet were 141,000 units during November in the US, according to data from NPD reprinted by Gamasutra.
During its debut month in October, the Media Molecule developed title shifted 215,000 copies, making it the eighth biggest-seller in the region behind other new releases Fable II and Fallout 3.
The numbers will be disappointing for Sony during the two busiest retail months of the year, when software sales during November alone were up 11 per cent, to USD 1.31 billion.
Other PlayStation 3 titles that outsold LittleBigPlanet during November were Activison's Call of Duty: World at War, Sony's Resistance 2 and Midway's Mortal Kombat Vs. DC Universe.