Grand Theft Auto V was one of the top ten most played games on Valve’s Steam Deck handheld this past week. It’s been in the top twenty for at least two years. But as of today, Valve now lists the game as “unsupported” — because developer Rockstar mysteriously broke compatibility with Valve’s handheld for its online modes.

PS5 games can be played on Steam Deck via the Chiaki app, offering the same handheld convenience you get with Sony's official PlayStation Portal. Set up Remote Play on the PS5 by enabling the feature with a toggle, then install Chiaki on your Steam Deck and link your console using a code generated by a simple script.

According to Valve, though, Rockstar could solve this minor technical issue with a single email.

Thanks to a recent update, Grand Theft Auto 5 and Grand Theft Auto Online can't be played on the Steam Deck.The Latest Tech News, Delivered to Your Inbox

The addition of BattlEye anti-cheat to GTA has made the game incompatible with the Steam Deck. Steam Deck players can no longer access the GTA Online portion of the game. Rockstar is blaming Valve, despite other BattlEye games being compatible with the platform.

Grand Theft Auto V ( GTA V), a game that has consistently ranked among the top 20 most-played games on Valve's Steam Deck for over two years, is now listed as "unsupported" by Valve. This unexpected change comes after Rockstar Games,

The reason for Valve listing Grand Theft Auto V (GTA V) as unsupported is that the developer, Rockstar, has reportedly disrupted compatibility with Valve's handheld for its online modes