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:

• Package Box : 204.5 x 194.2 x 15.5mm
• Photobook : 76p
• CD
• Lyrics Paper
• Random Folded Poster : Random 1 out of 7
• Random Unit Photocard : Random 1 out of 6
• Random Selfie Photocard : Random 1 out of 14
• Gleez Mini Poster
• A2 Poster : 1st Press Only