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.

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

Fans are frustrated with the rating change following the addition of BattlEye anti-cheat, which is incompatible with the Linux-based SteamOS.

Grand Theft Auto Online received an update, with the PC port of the crime sim finally getting anti-cheating software. Yet not everyone is happy, as this update has now made it impossible to play GTA Online on Steam Deck.

You may have noticed that Grand Theft Auto V is no longer verified on Steam Deck. That's seemingly because of the BattlEye new anti-cheat software for GTA Online, which rolled out earlier this week. As Rockstar explains in its official FAQ,