Hit the Notes to Your Own Beat: How to Play Custom Songs in Project SEKAI

Ever scrolled through YouTube or TikTok and watched someone pull off an insane, perfectly synchronized Full Combo on a Project SEKAI: Colorful Stage! chart of a song that isn’t actually in the official game? Maybe it’s an internet meme track, an indie Vocaloid masterpiece, or your favorite producer’s newest independent release.

While the official global and Japanese servers of Project SEKAI have an incredible library, they don’t support direct custom song imports out of the box. So, how are players doing it?

The secret lies in community-driven rhythm game platforms built precisely for custom charts. If you are ready to expand your SEKAI beyond standard limits, here is your complete guide to playing and experiencing custom songs.

Understanding How Custom Songs Work

Because modifying the official application file directly can lead to account bans or game instability, the rhythm game community relies on Sonolus—a powerful, open-source audio-visual application designed to play custom rhythm game servers, charts, and skins.