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Connect numbered islands with bridges so every island has exactly the right number of connections and all islands form one group. Also known as Hashiwokakero.
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About Hashi
Hashiwokakero — usually shortened to Hashi, and sometimes called “Bridges” — is a Japanese logic puzzle where you connect numbered islands with bridges. Each island (a circled number) must be connected to exactly as many bridges as its number indicates, and all islands must ultimately form a single connected network.
The bridges run horizontally or vertically between islands and may never cross each other. Pairs of adjacent islands can share one or two bridges, but no more. These constraints, combined with the connectivity requirement, create surprisingly intricate deduction chains even on small grids.
Hashi is distinctive among logic puzzles because its topology changes as you play. Each bridge you draw reshapes the network, opening some possibilities and closing others. The mental model of a growing graph rather than a fixed grid makes Hashi feel quite different from grid-filling puzzles like Sudoku or Nonograms.
It’s an excellent puzzle for people who enjoy network thinking — if you like graphs, circuits, or maps, Hashi will feel immediately natural and deeply satisfying.
Frequently asked questions
What is Hashi?
Hashi (Hashiwokakero) is a logic puzzle where numbered islands must be connected by bridges. Each island must have exactly as many bridges as its number, and all islands must be reachable from any other island.