Tap a marble to see its legal moves, then tap a glowing hole to move — jump an adjacent stone into the empty hole beyond, chaining across the board. Your marbles always sit at the bottom; emoji and messages you send pop up as blobs on your side. Hot-seat here (you play both sides); open ?view=moonto see Moon's perspective. The shipped version syncs you and Moon, with real per-person chat and tamper-proof win totals.