The Xbox port of the game sold 1.5 million units. Sold separately, Counter-Strike sold 4.2 million units at retail in its Half-Life-derived incarnation, while the updated Counter-Strike: Condition Zero and rebuilt Counter-Strike: Source sold 2.9 million and 2.1 million units respectively. Part of Half-Life's success can be attributed to the phenomenally popular Counter-Strike, which originally appeared as a free Half-Life mod. Gearbox Studios' expansion packs Half-Life: Opposing Force and Half-Life: Blue Shift sold 1.1 million and 800,000 units respectively.
Half-Life, the debut effort released by the PC-oriented Seattle-area studio a decade ago last month, put Valve on the map and remains its highest seller to date with 9.3 million units sold at retail, according to statistics released alongside a profile in the November 2008 issue of Game Informer magazine. (All of the following statistics were described as Valve's estimates of worldwide lifetime-to-date retail sales.) Independent developer Valve has released lifetime retail sales figures for most of its own titles released over the company's ten-year history, partially quantifying the company's ongoing success by demonstrating tens of millions of units sold.īut Valve kept some cards close to the chest, declining to reveal digital download numbers.
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