ThePuzzleLabs

Hashi — 15–20

Einstein

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Play Einstein Hashi — ThePuzzleLabs

Try this Einstein Hashi puzzle on ThePuzzleLabs.

00:00
Classic
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How to Play

Connect islands with bridges so each island's number matches its bridge count. All islands must form a single connected group.

👆

Click an island to select it, then click a neighbor to place a bridge.

🔄

Click an existing bridge to cycle: single → double → remove.

🚫

Bridges run horizontally or vertically and cannot cross each other.

🔗

All islands must be connected in one group when you finish.

💡

Use hints if you're stuck — up to 3 per puzzle.

🏆

Connect every island correctly to complete the puzzle.

Keyboard shortcuts
UndoU / Ctrl+Z
RedoCtrl+Y
HintH
DeselectEsc

Reveal the Solution?

This will fill in all bridges. The puzzle will be marked as "solved with reveal."

About Einstein hashi

Up to 20×20 grids with 35 to 60 islands. Einstein-certified puzzles are verified solvable with logic alone, no backtracking. The deduction chains run long and require you to hold multiple constraints in mind simultaneously.

If you've solved every expert puzzle and want more, this is the end of the line. The grids are the largest we generate, and each one was verified by our constraint propagation solver before publication.

All hashi difficulties · Rules & how to play · Printable puzzles