Download Cairn
One cross-platform Java .jar. It runs the same on Windows, macOS and Linux — no installer, no account, no launcher. Just save it and play.
Requires Java 17+ · Run with java -jar cairn.jar · SHA on request
Get Java
Cairn needs Java 17 or newer. Check with java -version; grab a free build from Adoptium if you need one.
Run the jar
Double-click cairn.jar, or run java -jar cairn.jar from the folder you saved it in. Your first world generates automatically.
Start mining
Left-click to mine, right-click to place, 1–0 to pick a block. F2 for a photo, F9 to record. See the help center.
Optional upgrade
Want Cairn Plus?
The game is complete and free. Plus is a one-time thank-you that adds cosmetic block skin packs and priority preview builds — nothing that changes how the game plays. Checkout runs through the platform's free-mode gateway: it records a real order, no card needed.
Cairn Plus
Cosmetic skins + priority builds. Yours forever.
- Everything in the free game
- Cosmetic block skin packs
- Priority access to preview drops
- A warm feeling of supporting the studio
Free-mode commerce · records a real order object; connect Stripe to charge live
Prefer to just play? You never have to buy anything. The creator license lets you monetize your Cairn videos on the free game, too.
Every platform, one file.
The download bundles native libraries for every desktop platform, so the same cairn.jar just runs.