Between Stars
Bridges
Cross every connection once
Stars may be visited again and again, but no bridge twice. Parallel bridges and dead ends make you think a few moves ahead. The rule goes back to Euler and the Seven Bridges of Königsberg.
Puzzle game for iPhone
Between Stars
Guide a glowing aura across sleeping star networks. Cross every bridge, or visit every star, and watch the sky wake up behind you.
Free to download for iPhone with iOS 16 or later. No ads, no subscription.
- 2 puzzle modes
- 330+ handmade levels
- 101 animal constellations
- No ads, timers or lives
Two rules, one sky
Every level is a small network of stars. Your aura waits on the first one, and you draw its route with one finger. Which rule applies depends on the mode.
Bridges
Starwalk
Visit every star once
Now the stars count, not the bridges. Use any connection you like, but never step on the same star twice. The rule comes from Hamilton's Icosian game, and a knight's tour follows it too.
Where the journey leads
Each mode starts with a short tutorial of 15 levels that introduces one idea at a time. After that, the sky opens up.
Star Atlas
100 geometric patterns per mode
Ten chapters: polygons, star polygons, lattices, tilings, rosettes, knots, spirals, fractals, solids and a final chapter of masterworks, sorted by how hard they really play.
101 animals hidden in the stars
In seven habitats, from forest to farm. Solve a level and the animal it was drawn from appears in gold, then takes its place on your sky map. The real sky has animals too: here are all its animal constellations.
A daily puzzle and endless Random
One new puzzle a day, the same for everyone, plus freshly generated networks in several levels of difficulty whenever you want more.
Made to be calm
No clock is running and nothing punishes a wrong turn. Take back a move, try another route, or come back tomorrow.
- Always solvable. A solver checks every level before it ships.
- Undo anything. Step back or restart as often as you like.
- Your sky, your style. Earn Resonance by playing and spend it on auras, star shapes and night skies.
- Synced with iCloud. Continue on another iPhone where you left off.
- Game Center achievements. For what you have done, never for playing on consecutive days.
- Respects Reduce Motion. Twinkling and glow effects calm down when you ask iOS to.
Free to start, fair by design
No ads, no subscription, no loot boxes and no paid hints. One optional purchase, once.
Free
€0
- Both tutorials, 30 levels
- The first Star Atlas chapter in each mode
- The forest constellations in each mode
- The daily puzzle, every day
- 5 Random puzzles a day
The Whole Sky
€2.99 one-time
- All ten Star Atlas chapters in both modes
- All seven constellation habitats
- Unlimited Random puzzles
- Shareable with Family Sharing
Download Between Stars
Free on the App Store for iPhone with iOS 16 or later. Questions, bugs or ideas? Write to us through the support page — every note is read.
Questions
Where can I download it?
On the App Store, for iPhone with iOS 16 or later. Use the App Store button on this page or search for “Between Stars” in the App Store. Downloading is free, and there are no ads.
Is Between Stars free?
Yes, it is free to download and free to play, with no ads. Both tutorials, the daily puzzle, the first Star Atlas chapter and the first constellation habitat cost nothing. A one-time in-app purchase, The Whole Sky, opens every chapter and habitat and removes the daily limit on Random puzzles. There is no subscription.
What is the difference between Bridges and Starwalk?
In Bridges you have to cross every connection exactly once, and you may pass through a star as often as you like. In Starwalk you have to visit every star exactly once, and you choose which connections to use. The same network can be easy in one mode and hard in the other.
Is Bridges the Seven Bridges of Königsberg problem?
It is the same idea. In 1735 Leonhard Euler showed that nobody can walk through Königsberg crossing each of its seven bridges exactly once, because all four parts of the city touch an odd number of bridges, and a walk like that can have at most two such places: where it starts and where it ends. Every level in Between Stars is checked by a solver before it ships, so unlike Königsberg, each one has a solution.
Where does Starwalk come from?
In 1856 the mathematician William Rowan Hamilton invented the Icosian game: find a round trip along the edges of a dodecahedron that visits each of its 20 corners exactly once. A London toy maker sold it from 1859. Such routes are now called Hamiltonian paths, and one Star Atlas level is a tribute to Hamilton's puzzle.
Do I need an account or an internet connection?
No. There is no sign-up and the game plays fully offline. If you are signed in to iCloud, your progress syncs between your devices, and if you use Game Center, your achievements are recorded there.
Can I undo a move?
Yes, as often as you like, and you can restart any level. There are no timers, no lives and no penalties. A puzzle you have started always stays playable, even after the daily limit for Random puzzles is reached.
Sources
More on the maths behind Bridges: The Seven Bridges of Königsberg, explained and how to solve any one line puzzle. Auf Deutsch: Das Haus vom Nikolaus.