1. Download cnc-ddraw.zip v7.1.0.0 from https://github.com/FunkyFr3sh/cnc-ddraw/releases/tag/v7.1.0.0
2. Unzip cnc-ddraw.zip into the game directory.
   • For steam deck this is /home/deck/.local/share/Steam/steamapps/common/Nancy Drew The Creature of Kapu Cave/
   • For others, it is usually either ~/.local/share/Steam/steamapps/common/Nancy Drew The Creature of Kapu Cave/ or ~/.steam/steam/steamapps/common/Nancy Drew The Creature of Kapu Cave/
   • If neither, then on the game's steam library page, select Properties > Installed Files > Browse to the game's directory
3. On the game's library page select Properties > General, add the following to the game's Launch Options: WINEDLLOVERRIDES="ddraw=n" %command%

This fixes issues with the DirectDraw api. Projects like dgVoodoo, DDrawCompat, DxWrapper, and more on this page https://emulation.gametechwiki.com/index.php/Wrappers also fix this. dgVoodoo no longer supports proton/wine, but the others may work.