Julius is a fully working open-source version of Caesar 3, with the same logic as the original, but with some UI enhancements, that can be played on multiple platforms. Julius will not run without the original Caesar 3 files. You can buy a digital copy from GOG or Steam, or you can use an original CD-ROM version. The goal of the project is to have exactly the same game logic as Caesar 3, with the same look and feel. This means that the saved games are 100% compatible with Caesar 3, and any gameplay bugs present in the original Caesar 3 game will also be present in Julius.