A group of Chinese modders has been working on a single-player version + LAN multiplayer. They are less interested in a "private server" and more interested in preserving the game offline.
As of May 2026, the demand for private servers has slightly shifted due to the revival of on the VFUN platform. mstar private server
While not as pretty as MStar, Audition Online (now known as Audition: Dance Battle on Steam in some regions) is still alive. It is 2D/3D hybrid, but the beatmaps are arguably harder. A private server isn't needed because the official Brazilian and Korean servers are still running. A group of Chinese modders has been working
The Quest for an MStar Private Server: Status and Alternatives For long-time fans of the Unreal Engine-powered rhythm MMO (originally known as While not as pretty as MStar, Audition Online
have occasionally discussed reverse-engineering the game's binary files. However, creating a functional server from scratch without official source code is an immense technical undertaking that has yet to produce a stable public result. The Global Revival