Eulerian
Trace every edge. Solve the path.
A 300-year-old puzzle, reimagined for your fingertips.
In 1736, mathematician Leonhard Euler asked whether you could cross every bridge of Königsberg exactly once. That question gave birth to graph theory. Eulerian turns this elegant problem into an addictive puzzle game — trace every edge of the graph without retracing your steps. No repeats. No leftovers.
Beautiful notebook aesthetic, hand-sketched puzzles.
Every puzzle feels like it was drawn by hand on a real notebook page. Torn-edge dividers, warm paper textures, and smooth animations create a calming, tactile experience. Choose from 16+ themes to make the game truly yours.
Select
Tap a starting node on the graph.
Trace
Draw your finger along each edge.
Solve
Traverse every edge exactly once.
Earn
Get star ratings based on speed.
Start simple. Get deviously tricky.
Begin with straightforward 3-node graphs and work your way through increasingly complex structures. 200+ handcrafted levels across 10 packs are validated to always have a valid Eulerian path — every puzzle is solvable, but finding the solution is the challenge.
Beginner
Simple shapes, 3–4 nodes
Packs 1–3Intermediate
Crossing edges, 5–6 nodes
Packs 4–6Advanced
Dense graphs, 7–8 nodes
Packs 7–8Expert
Complex multi-path puzzles
Packs 9–10Infinite puzzles, procedurally generated.
Finished the campaign? Jump into Endless mode with procedurally generated puzzles that never run out. A seeded random number generator ensures deterministic graphs, so every puzzle is fair and always solvable.
Deterministic Generation
SeededRNG produces the same puzzle for the same seed — share challenges with friends.
Smart Hints
Hierholzer's algorithm powers the hint system — get nudged in the right direction when stuck.
Offline Play
No internet required. Play anywhere, anytime — on the plane, in a café, wherever.
Make it yours with 16+ notebook themes.
From warm Washi paper to electric Neon, every theme transforms the entire game board — background, nodes, edges, and effects. Free themes ship with the game; premium themes unlock a deeper palette.
Centuries-old math, modern minimalism.
Based on a problem first posed by Leonhard Euler in 1736, Eulerian brings graph theory to your fingertips in a beautiful, approachable package. No math degree required — just curiosity and a love for elegant puzzles.