The title reached the number one chart position in all key territories, and is still at the number two position in most territories five weeks after its first release.
Sales for the first five weeks of the latest Lara Croft installment exceed the internally budgeted number of units for Tomb Raider Legend for the financial year as a whole, the company said.
Tomb Raider Legend is the fastest selling computer game of 2006 in the UK so far, and the fastest selling Tomb Raider game in the series.
With the success of Tomb Raider, plus the planned launches for the remainder of the financial year, SCi Entertainment believes it remains on track to achieve its target profitability for the 12 months ending June 2006.
Jane Cavanagh, chief executive at SCi Entertainment, said that she was looking forward to the "imminent" release of the firm's forthcoming Hitman: Blood Money.
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