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- Halcyon was originally made for BOF2010. With ?????? points, it placed 1st overall, making it one of the most well-known BMS songs.
- Because of its popularity in BMS, Halcyon also appeared in Cytus, SOUND VOLTEX, Groove Coaster, CHUNITHM, オンゲキ, STELLIGHTS, Muse Dash, and Tapsonic Top.
- Halcyon is the only song in Luminous Sky that was not composed specifically for Arcaea.