The lawsuit, filed by more than a dozen states, alleges TikTok purposefully manipulates younger users into remaining on the app.

More than a dozen states are filing lawsuits Tuesday accusing TikTok of harming the well-being of children by using addictive product features that keep them hooked on the platform, in a bipartisan salvo that amplifies the company’s legal perils as it tries to stave off a federal ban.

But first, the 13 states and the District of Columbia that have filed a series of lawsuits will have to prove their claims that TikTok is intentionally designed to be addictive to kids. And those addictive features,