Serious Sam
HD: Gold Edition
There is a HD: Gold Edition available on Steam, which includes HD remakes of both Serious Sam HD First and Second Encounter, plus the original versions.
Add custom resolution:
In this example we will change the resolution to 1680 x 1050:
Go to your Serious Sam install directory, open the Scripts folder and open PersistentSymbols.ini. Then change these variables:
persistent extern INDEX sam_iScreenSizeI=(INDEX)1680;
persistent extern INDEX sam_iScreenSizeJ=(INDEX)1050;