Borderlands sells 6 million units

[Barozi]

"Gearbox’s CEO, Randy Pitchford, said during a developer’s session at Rezzed that the first Borderlands game has sold 6 million units – something remarkable for a new IP – {...}"

http://www.dsogaming.com/news/borderlands-sold-6-million-units-borderlands-2-pc-will-be-the-best-version/

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We're at 4.46m and the PC version is obviously undertracked. I'd say pretty spot on.