Activision's Call of Duty-related headaches just leveled up.

More than three dozen former and current employees of Infinity Ward, the Encino-based development studio that made the hugely successful Call of Duty: Modern Warfare video games for Activision Blizzard Inc., have sued the publisher claiming that they are owed between $75 million and $125 million in unpaid royalties and potentially more in compensatory damages.

The move by the 38 current and former staffers comes a little over a month after former Infinity Ward heads Jason West and Vince Zampella were fired by Activision and filed their own $36-million lawsuit against the Santa Monica-based publisher over allegedly unpaid royalties.

Two weeks ago, West and Zampella formed a new development studio called Respawn Entertainment and signed a deal with Activision's chief rival, Electronic Arts, Inc.

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