Underplayed Gems

Yunyun Syndrome!? Rhythm Psychosis (2026)

Yunyun Syndrome!? Rhythm Psychosis cover
Developer
Alliance Arts, WHO YOU
Publisher
Alliance Arts
Platforms
Windows
Genres
Adventure, Indie, Simulation
Rating
4.6 of 5, 3,990 player ratings
Typical playtime
about 8.7 hours
Where to get it
Steam

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The catalog in 3D

The same catalog has a room you can walk around in. The cat behind the counter is the AI Catbot, and they pick real games from it when you tell them what you feel like playing. Nothing is for sale, here or in there. Go in from here and this game is already out on the counter, with more like it waiting on the shelf next to it.

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How it feels

A chaotic, denpa-fueled rhythm adventure where you lose control to spread internet brain rot.

rhythmdenpabrain rotchaoticdarkly humorousadventuresimulationhigh energy

What players say

Players praise the music, art, and unhinged storytelling, but the English translation is widely condemned for inserting Zoomer slang, with many recommending fan patches. The game is a 4-key rhythm game with a thin song list and DLC complaints, though its denpa aesthetic and character appeal create a cult following.

Screenshots

Yunyun Syndrome!? Rhythm Psychosis screenshot 1Yunyun Syndrome!? Rhythm Psychosis screenshot 2Yunyun Syndrome!? Rhythm Psychosis screenshot 3Yunyun Syndrome!? Rhythm Psychosis screenshot 4Yunyun Syndrome!? Rhythm Psychosis screenshot 5Yunyun Syndrome!? Rhythm Psychosis screenshot 6

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This page is from Underplayed Gems, a catalog of older and overlooked games. Not quite it? You can browse by platform and genre, or take this one into the 3D catalog and ask the Catbot for something closer.