Irisu Syndrome is a Japanese puzzle game with psychological horror elements, developed by a doujin circle named PlatineDispositif. Players must clear falling blocks while the story unfolds through visual novel-style sequences, revealing a mysterious and unsettling narrative. The game is notable for its eerie atmosphere, unique mechanics, and cryptic storytelling, which has led to a devoted fanbase and several fan translations. Its blend of puzzle and narrative elements make it a cult classic.