Alpine ArcadeNumber puzzle

Cairns.

Every row, column and field holds the stones 1 to 9, once each. Rebuild the cairns and mark the way.

1UPHI-SCORE ------FREE PLAY

Alpine Arcade presents

Stack the stones true

Music

© 2026 alpine.io

◀ Arcade

Your mission

The cairns

Above the treeline, there are no trail signs. Climbers find the way by cairns: stones stacked by those who came before.

The path ahead has nine fields of nine cairns each, and too many have fallen. Rebuild them.

Every row, every column and every 3×3 field must hold the stones 1 to 9, once each. Some stones are still standing. They’re right; build around them.

Pencil in notes when you’re unsure. Stones that clash glow red. Reveal a stone if you’re lost, at a cost.

Build every cairn true, and the way is marked for whoever comes next.

The clock starts at GO. Build true.

  • 1–9 place a stone
  • Shift + 1–9 note
  • Backspace erase
  • Arrows move

Whiteout!

The weather won this time.

Every climb goes better roped in. Let’s talk →

More games

Play like an app

  1. Tap the Share button in your browser.
  2. Choose Add to Home Screen.
  3. Open Cairns from your home screen. It plays full screen, with no browser bars.

Credits

Game
Cairns, by Alpine Internet in Bend, Oregon, for the Alpine Arcade.
Menu music
Melody Start Menu 2 loop by neko_4444. License: Creative Commons 0. Converted to MP3 for the game.
Game music 1
Broken Vintage Jazz Radio Loop – Post-Apocalyptic Speaker 160 BPM by TommasoMotteran. License: Attribution 4.0. Converted to MP3 and made louder for the game.
Game music 2
Loop. An intense cinematic track for an active episode of your movie by Lumamorph. License: Creative Commons 0.
Game music 3
Drama Strings.mp3 by younoise. License: Creative Commons 0. Made into a loop, slightly louder, for the game.
Fanfare
Victory Fanfare (8-Bit Thunder) 4 by SilverIllusionist. License: Attribution 4.0. Trimmed of its closing silence and converted to MP3 for the game.
Thunder
Thunder - Thunder Cracks Like Wind by PNMCarrieRailfan. License: Attribution NonCommercial 4.0. Shortened to the first thunderclap, with a fade at the end, for the game.
Scream
wilhelm_scream.wav by Syna-Max. License: Attribution NonCommercial 4.0. Converted to MP3 for the game.