Rhythm free
No music requirement — visual timing only.
What is Arc Swing?
Arc Swing is a free browser demo from Iron Harbor. Stop the swinging needle inside the green harbor zone — chain perfect hits. This page is editorial only — no deposits, no real-money prizes.
How it plays
- Watch — The needle sweeps back and forth across the arc.
- Stop — Tap when the tip sits inside the green zone.
- Chain — Each success narrows the target zone slightly.
- Harbor — Miss the zone and the chain resets.
Desk notes
Industrial look
Riveted panel aesthetic, not cartoon candy.
High score
Longest chain stored locally.
Open the free demo — same domain, no store redirect.
Launch Arc Swing