Arcade : O is the seventh mini album by GHOST9. It was released on October 25, 2023 with "Ruckus" serving as the album's title track.

Tracklist:

1. Let's Get Lost
2. Ruckus
3. B.O.M.C. (Bang On My Chest)
4. Rolling Stones
5. Love Parachute
6. 책갈피

Inclusions:

• Nemo Album Full Ver : 90 x 62 x 12mm
• Nemo Card(QR Type)
• Jacket Photocard : 8EA
• Random Selfie Photocard : Random 1EA
• Group Random Photocard : Random 1EA