Gamasutra reports on a lawsuit against Zynga and Activision Blizzard over a gaming patent for distributed electronic tournaments filed by Walker Digital, parent of Priceline.com, the discount airfare and hotel room site. Word is the patent covers "a method and a system for a distributed electronic tournament system in which many remotely located players participate in a tournament through input/output devices connected to a central controller which manages the tournament." They say: "The lawsuit alleges that Activision Inc., Activision Publishing, Activision Blizzard, Blizzard Entertainment, and Zynga have released a total of 24 products infringing on that patent, including Call of Duty: Modern Warfare 1 and 2, Call of Duty: Black Ops, Call of Duty: World at War, Blur, Wolfenstein, DJ Hero 2, Golden Eye 007, World of Warcraft and its expansions, Mafia Wars, and many others."