Serious Sam — Cannot Set Display Mode

: For GOG versions, editing PersistentSymbols.ini in the Scripts folder and changing sam_iScreenSizeI and sam_iScreenSizeJ is often required for modern 16:9 displays. 2. GPU and Driver Adjustments

You can force the game to start in your monitor's native resolution by editing the configuration files. Serious Sam Cannot Set Display Mode

These versions usually fail due to missing redistributables or API mismatches. Steam Community : For GOG versions, editing PersistentSymbols

For a visual guide on manually editing your resolution and FOV settings: : For GOG versions