Bethesda's Elder Scrolls V: Skyrim has sold over 20 million copies worldwide.
A small note at the bottom of a recent Elder Scrolls Online press release mentioned the milestone.
"As the sequel to the 2002 Role-Playing Game of the Year, The Elder Scrolls III: Morrowind, and the 2006 Game of the Year, The Elder Scrolls IV: Oblivion, Skyrim earned hundreds of 'Game of the Year' awards and sold over 20 million copies," it reads.
The news puts the title among the greatest-selling video games of all time, among such company as Super Mario Bros 3 (18 million), Super Mario World (20.6 million) and Pokemon Red and Blue (23.64 million).
However, it is not the best-selling game of the previous generation. Rockstar's Grand Theft Auto V currently stands at around 29 million copies sold into retail, with further sales likely to come from potential additional DLC and the long-rumoured GTA V for PC, should they materialise.
Earlier this month, Bethesda's Skyrim website listed next-gen versions of the game alongside the existing Xbox 360, PS3 and PC editions.
Bethesda later dismissed the listings as a website error, stating there are no plans to release Skyrim on Xbox One or PS4.