Misconfigured settings are a frequent cause for this specific error. Delete Configuration Files : Navigate to the game folder (usually .../steamapps/common/Sonic Generations ) and delete files named audioconfig statsconfig graphicsconfig Re-run the Tool : Open Steam, right-click Sonic Generations Properties , and choose the Set Admin Privileges : Right-click ConfigurationTool.exe in the game folder and select Run as Administrator to ensure your changes are actually saved. 3. Verify Integrity of Game Files
A corrupt file might be causing the game to lose connection with the Steam client. Steam Library , right-click Sonic Generations Properties Installed Files Local Files How To Fix Sonic Generations Steam Client Is Not Running
If the game still won't launch, I can help you dig deeper. Let me know: Are you using any ? What version of Windows are you on? Does the Configuration Tool open, or does it crash too? Misconfigured settings are a frequent cause for this
Ironically, your antivirus might be the villain in this story. Because Sonic Generations uses DRM (Digital Rights Management Verify Integrity of Game Files A corrupt file
Here is how to fix it, starting with the easiest solutions and moving to more advanced troubleshooting.
The Steam Overlay injects code into the game to provide Shift+Tab functionality. For Sonic Generations specifically, this injection can occasionally confuse the DRM layer.