How to Play Custom Songs on Project SEKAI: The Ultimate Guide

Project SEKAI: Colorful Stage! (featuring Hatsune Miku) boasts an incredible, ever-expanding tracklist filled with Vocaloid classics, commissioned masterpieces, and catchy unit covers. But eventually, every rhythm gamer hits a point where they wonder: “Can I play my own favorite songs or custom charts here?”

Unlike games with built-in mod support, Project SEKAI doesn’t natively let you drop an MP3 into a folder and tap away. However, thanks to the rhythm game community’s ingenuity, there are brilliant workarounds and ecosystem tools—most notably Sonolus—that let you experience custom charts, fan-made layouts, and your dream song lists.

Here is everything you need to know about diving into custom songs for Project SEKAI.

Understanding the Reality: Modding vs. Sonolus

Before diving in, it is important to clear up a common misconception. Modifying the official Project SEKAI mobile application to inject custom songs directly into the live retail game is heavily restricted, risks account bans, and often breaks with every weekly game update.

Instead, the global rhythm game community relies on Sonolus—a free, open-source platform designed specifically to play customizable rhythm game engines (including a faithful recreation of the Project SEKAI / Colorful Stage gameplay engine).