A Maine mother is suing several popular video game companies, accusing them of profiting off of her 9-year-old and other children who have become addicted to their products.

“This litigation is not a war on fun,” Casey Henderson’s complaint, filed Tuesday in U.S. District Court of Maine, begins.

Instead, she claims these corporations — known for games like Fortnite, Minecraft and Roblox — have concealed the “known risks” of excessive gaming from parents, exploiting a system of endless puzzles, obstacles and add-on purchases that make it harder for kids to log off.

“It becomes this fantasy world, where you never run out of things to do,” Henderson’s attorney Brett Dwight Baber said in an interview. For Henderson’s child, Baber said, this has come “at the expense of their school work, their family life, (and) their friends.”

Henderson is suing Roblox Corporation, Epic Games, Inc., Microsoft Corporation and its subsidiary Mojang AB. The companies did not immediately respond to requests for comment on Wednesday.

Other families across the country are also challenging video game companies in court, seeking to protect children from sexual content and pedophiles. A mother in San Francisco recently filed a wrongful death lawsuit against Roblox last week after learning her son was coerced into sending explicit images of himself to an adult. Her son later died by suicide. Louisiana’s attorney general sued Roblox over similar child safety concerns in August.

Henderson’s lawsuit raises concerns about child safety, but focuses more on behavioral health consequences. The lawsuit says addiction to video gaming has been a “recognized, diagnosable mental disorder” in the U.S. for more than 10 years and it cites research showing the ways children’s brains change after playing these games.

Henderson is seeking financial damages, with the amount to be determined in court. Baber said the family also wants to use their lawsuit to modify how these businesses operate.

These video games “have parental controls but they basically rely on the child to enlist the parent to pursue the parental controls,” he said. “There’s no age verification on many of the products.”

Henderson said her child started playing video games at 4 years old and now has a “disordered relationship” with them. According to the lawsuit, her child has had outbursts, struggled academically and has shown a lack of interest in other hobbies.

Video games are more accessible today than ever and more profitable, according to the lawsuit. Their profits, the lawsuit claims, depend on how long they can draw kids in and increase what they spend on in-game purchases.

It’s free to sign up for these games, according to the complaint. While there are some age restrictions on what a user can see in games like Roblox, Henderson’s complaint alleges it’s easy for children to skirt around them.

It wasn’t until last year that Roblox began allowing parents to limit screen time and now that only applies to young children, the complaint states.

Minecraft restricts what players younger than 16 see, but Henderson’s lawsuit claims the game doesn’t require age verification or parental consent.

All three games were designed with “intentionally addictive features,” employing psychologists and behavioral health experts to help develop games that are hard to put down, the lawsuit claims.

Fortnite, for example, uses an “achievement system” that rewards users as they complete more missions and shows how they compare to other players, according to the lawsuit.

“This system is designed to keep users engaged with the game, incentivize long periods of gaming over many days, and ultimately increase Epic Games’ profits,” the complaint states, referring to the company that owns Fortnite.

Baber said he anticipates more complaints will appear in Maine, but he declined to say whether that includes any from other people he represents.

Baber said the allegations against these video game companies are “very much akin” to what multiple states claimed when they sued the country’s biggest tobacco companies in the late 1990s.

“The companies were manipulating nicotine content,” he said. “Here, they’re manipulating the content to increase the amount of play time that leads to these serious cases of addiction.”