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That's according to Ars Technica, which has been randomly polling a public user base of 172 million Steam Community IDs for two months to come up with its results. There's a much more detailed explanation of how it works on Ars Technica.
The top 20 games are almost all Valve made: Half-Life 2 add-on Lost Coast has nearly 13 million estimated owners, Counter-Strike: Source nearly 12 million and Half-Life 2: Deathmatch 11 million.
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