Call of Duty: World at War Map Packs 2 and 3, co-developed by Certain Affinity, ranked in the top three North American downloads in 2009 for the PlayStation Network. Released in June, Map Park 2 sold over one million copies in just four days. In August, Certain Affinity released Map Pack 3, which sold over one million copies in its first weekend.
“…The Call of Duty map packs have been unstoppable since they were released – selling millions across platforms each, it’s quite amazing.”
-Ryan Langley, Gamasutra.