http://www.gamasutra.com/php-bin/news_index.php?story=21319

Retail sales

HL1: 9.3 million

HL2: 6.5 million (without steam)

Orange box: 3 million

Counter strike: 4.2 m

Counter strike  Cond zero: 2.9 m

Counter strike source: 2.1 m

The Xbox port of Counter Strike sold 1.5 million copies.  If they only updated it with the source engine and had it on the 360.

Here's a more detailed sales:

Half-Life: 9.3 million units
Half-Life Opposing Force: 1.1 million units
Half-Life Blue Shift: 800,000 units

Counter-Strike: 4.2 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: 6.5 million units
Half-Life 2 Episode 1: 1.4 million units

The Orange Box: 3 million units


Keep in mind that these are only retail. I think if they had included Steam sales, this list would blow everyone's minds.

Wait... I think I saw an article stating that less than 50% of the Orange Box' sales were from retail, meaning that it was Valve's least % retailed game.

I cannot find it though. Anybody else remember it? It was posted on VGChartz.

I'm glad a masterpiece like Half Life 2 has earned massive chips. It's not so much a game as a life experience. :)