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Killergran said:
Wow. Valve shifts some serious amount of copies.

Half-life 2 sales should be, with steam included, not that far behind Half-Life. Nice find :)

If you count the Orange Box, it already passed it.  Add in the Steam sales and it is probably way ahead.

Also, for easier reading

Half-Life: 9.3 million units
Half-Life 2: 6.5 million units
Counter-Strike: 4.2 million units
The Orange Box: 3 million units
Counter-Strike Condition Zero: 2.9 million units
Counter-Strike Source: 2.1 million units
Counter-Strike Xbox Port: 1.5 million units
Half-Life 2 Episode 1: 1.4 million units
Half-Life Opposing Force: 1.1 million units
Half-Life Blue Shift: 800,000 units
Just copied it off gaf