Switch to the Compatibility tab, and enable Reduced color mode and set it to 16bit. Windows 8 and 10 users: Please right-click on the game's shortcut, select Properties. If the game was installed via offline installer, then you will have to manually navigate to the game installation folder, by default it's: C:\GOG Games\Caesar 3\
If the game was installed via GOG GALAXY, please select the game in GOG GALAXY, click on Customization -> Manage Installation -> Show Folder In order to navigate to game's installation folder: Once downloaded extract it's content, the C3.inf and C3Map.inf files, to the root of game's installation folder, overwriting existing ones.
