An estimated 80 million people play Roblox every day and it has more monthly users than the Nintendo Switch and Sony PlayStation combined.
Roblox made a deal with Charli XCX last year to use her music and likeness as part of an in-game concert within Dress to Impress - one of the most popular experiences on the platform.
Ms Heyer was reportedly in talks with Roblox to license the Apple dance but her lawyer tells Newsbeat Roblox used it without a "signed agreement".
"Kelley is an independent creator who should be compensated fairly for her work and we saw no other option than to file suit to prove that," says Miki Anzai, who's representing Ms Heyer.
"We remain willing and open to settle and hope to come to a peaceful agreement."
Ms Heyer previously told Newsbeat about kicking off the trend when she debuted some moves for the "unappreciated" track from Charli XCX's award-winning album, Brat.
At the time she said she had seen "large brands or huge creators" capitalising on the trend without crediting her.
"And that sort of bums me out a little bit," she said.
"That could have been a really good opportunity, really good exposure for me."