Wait. You are running Steam. You’re literally looking at it. So why is a decade-old action game gaslighting you?

You click "Play" on your Steam library. The splash screen appears. You wait for the metallic crunch of the opening cinematic... and instead, you’re greeted by a tiny, infuriating dialog box:

Fast forward to today. Steam has undergone massive backend overhauls, including the way it handles user authentication, cloud saves, and—critically—the Steamworks API. Sometimes, the old CEG handshake gets confused. It looks for a specific, older version of Steam's authentication token, and when it finds the modern version, it throws its hands up and yells, "No Steam detected!" If you’ve been troubleshooting PC games for a while, your first instinct is to right-click the game in Steam > Properties > Local Files > Verify integrity of game files . Good habit. But in this case, it’s useless.