Groove to Your Own Beat: The Complete Guide to Playing Custom Songs and Charts in Project SEKAI

If you have spent any time browsing YouTube or TikTok, you’ve likely stumbled upon jaw-dropping rhythm game videos: custom charts of internet meme songs, hidden Vocaloid gems, or impossibly difficult challenge patterns being played with the familiar interface of Project SEKAI: Colorful Stage! (or Hatsune Miku: Colorful Stage!).

Naturally, you might be wondering: Can I play custom songs directly inside the official app?

The short answer is no—the official Project SEKAI client does not support importing arbitrary third-party audio files or external custom charts for copyright and security reasons. However, the rhythm gaming community has engineered an incredible workaround. Through custom platforms, specialized servers, and community-driven applications, you can easily play, share, and even create your own custom Project SEKAI charts.

This guide breaks down everything you need to know about how custom songs and charts work in the Project SEKAI ecosystem.

Understanding How Custom Songs Work

Because modifying the official game app risks a ban and doesn’t natively accept external tracks, the community relies heavily on Sonolus—a powerhouse audio-visual application designed to emulate rhythm game engines.