Californian regulators are taking legal action as part of an investigation into claims of gender bias at Riot Games.
The studio is behind the hugely popular online game League of Legends.
The California Department of Fair Employment and Housing (DFEH) is seeking evidence that Riot is paying women less than men.
DFEH said it was also looking into accusations of sexual harassment and assault at the firm as well as discrimination on pay and promotion.
Right to sue
The “enforcement action” filed by DFEH against Riot aims to force the game-maker to hand over information about employee pay.
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