Worlds Inc. filed a patent infringement lawsuit against Activision Blizzard, Inc., Blizzard Entertainment, Inc. and Activision Publishing, Inc. in the United States District Court for the District of Massachusetts on March 30, 2012.

Activision's World of Warcraft and Call of Duty video games have been identified in the complaint as infringing on Worlds' patents. Max L Tribble, lead counsel of Susman Godfrey L.L.P, will be lead counsel for Worlds in the suit. Tribble has an extensive track record of patent infringement lawsuit wins and settlements for plaintiffs in lawsuits against large corporations, including: Paltalk v. Microsoft; Mass Engineered Design v. Ergotron & Dell, et al; Sky Technologies v. Oracle; and Sky Technologies v. IBM.

Worlds Inc. owns US patents numbers 8,082,501, 7,493,558, 7,945,856 and 7,181,690 titled "System and Method for Enabling Users to Interact in a Virtual Space" and has additional continuation claims in process before the U.S Patent & Trademark Office (USPTO). These patents relate to computer architecture for three-dimensional graphical multi-user interactive virtual world systems. Such systems are utilized in Massive Multi-Player Online Role-Playing Games (MMORPG).

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