Ubisoft is suing Apple and Google for a Chinese mobile game that says "an almost carbon copy" of one of its most popular games, Rainbow Six: Siege.
Area F2 is "designed to closely replicate ... practically every aspect" of the game, he says, in a 43-page document, complete with screens.
He is also suing the developer, Ejoy, owned by the Chinese technology giant Alibaba.
Characters, game modes, game maps, animations and even the user interface have been copied, says the document.
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"Virtually every aspect of AF2 is copied from the R6S, from the operator selection screen to the final score screen and everything else," says Ubisoft.
"In fact, the games are so similar that an ordinary observer viewing and playing both games probably wouldn't be able to distinguish between them."
Ubisoft estimates that the F2 area has been downloaded over a million times and made "tens of thousands of dollars" on in-game purchases.
He says it raised the problem with both Apple and Google, who suffered reduced sales on their respective app stores.
"But rather than taking any steps to stop or reduce the infringement ... Google and Apple instead decided it would be more profitable to collect their share of AF2 revenue and continue their illegal distribution," Ubisoft says in his judicial filing. .
His observations in court also state that Rainbow Six: Siege, released in 2015, is "among Ubisoft's most valuable gaming properties", with three million players every day.
The game series is based on a Tom Clancy novel of the same name.
Ubisoft is seeking a jury trial on the alleged copyright infringement at the Central District Court of California.
Apple declined to comment on the case.
Google and the app developer did not immediately return requests for comment.
