The game has outsold combined sales (UK) in the region of the original Fallout and its sequel, and spin-off titles Fallout Tactics and Fallout: Brotherhood of Steel.
First week sales were also 57 per cent stronger than the first week performance of Bethesda's The Elder Scrolls IV: Oblivion.
According to data from GfK Chart-Track, 55 per cent of all sales were on the Microsoft format, 28 per cent on Sony's home console and 17 per cent for the PC.
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