Hi there from all build engine games including Duke Nukem 3D Shadow Worrier and Blood.
When you go to setting and select VESA 800 x 600 the screen looks better but I get constant flicking. Anyone know a fix for this, thanks.
I'm not seeing this 800x600 issue on my end on Windows 8, although I only have Duke Nukem 3D to test. This is probably some issue with the graphics driver; try changing to a different output mode with Graphic Mode Setup (in the Start screen/Start menu or the installation folder).
Alternately you could run the games in modern source ports; EDuke32
for Duke Nukem 3D, I think JFSW
is the one for Shadow Warrior... I'm not sure which one is best for Blood. That would fix the problem and also allow optional improvements like widescreen resolutions.