There should be a 3dfx specific tab with the option to adjust Gamma in the display properties tab for the card, or you can set the environment variables in AUTOEXEC.BAT at startup.

https://www.mdgx.com/3dfx.htm

Look for "Gamma" in the SST_ commands.

Example: SST_GGAMMA (Green Gamma) or SST_GAMMA (Global Gamma)

and so on.

@Meatball, thanks, that helps, I was worried something is wrong with my card, my other two (under win98) don't share this problem as well as V2 SLI and V3. 😁

I think you can also set these options on the fly in windows, e.g. have a batch file to set various SST variables then call your games exe... at least thats what i do with quake and quake2 😁

3dfx's bright gamma (1.3 on v2/3, 1.7 on vg) is a design default, likely coming out of the arcade industry as all those big ol CRTs tend to be dark.