Google is preparing to head back to court on Monday to appeal a ruling that found its app store was a monopoly — one of three major antitrust suits against the tech firm.

The legal showdown between Google and Epic Games continues, focusing on claims of monopolistic practices in app access and in-app transactions on Android devices. Google is appealing a ruling that mandates competition in its Play Store,

Google says that the trial judge committed legal errors in the antitrust lawsuit, which unfairly favored Epic Games, the creator of Fortnite. In a 2020 lawsuit, Epic Games accused Google of monopolizing the way consumers access apps on Android devices and pay for transactions within apps.

Epic Games is launching an additional 19 games for its third-party app store in the EU, once some bugs are worked out, and it has also promised to pay the Core Technology Fee for apps on its store.

Lawyers for Alphabet's Google and "Fortnite" maker Epic Games are set to square off before a U.S. appeals court in California on Monday, as Google tries to undo a jury verdict and a judge's order forcing it to revamp its app store.