Project Arrthythmia

Avoid the musically timed pulse of blocks and bars, and in the process, you might just find out what this mysterious "Project Arrhythmia" is. Features Arcade Mode: A fun way to play user-made levels with your friends in up to 8 players Local Co-Op. "Project Arrhythmia" is a musical bullet-hell in which all things beautiful are deadly. Steam Workshop: Full integration with Arcade Mode. Level editor: A robust and easy to pick up a level editor for user-created content, built right into the game.
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