What is Hashi?
Hashi is an online Bridges logic puzzle, also known as Hashiwokakero or Hashi. The grid contains numbered islands, and your job is to connect the islands with horizontal or vertical bridges until every number is satisfied.
Between two visible islands, you can place one bridge, place two parallel bridges, or leave that route empty. A finished Hashi puzzle has every island connected into one network, with no bridge crossings.
- Connect islands only horizontally or vertically.
- Use at most two bridges between the same pair of islands.
- Bridges cannot cross other bridges or pass through islands.
- The number on each island shows its exact bridge total.
- All islands must belong to one connected network.
How to play Hashi online
Click the clear route between two islands to cycle through zero, one and two bridges. The game counts your current bridges, keeps the puzzle bright and readable, and lets you check the current board without revealing the full answer.
A solved board must satisfy every island number and connect every island together. If one island group is isolated, the numbers may look correct locally, but the Bridges puzzle is not complete.
- Click a possible bridge route once for a single bridge.
- Click it again for a double bridge.
- Click a third time to clear the route.
- Use Check to find number, crossing and connectivity issues.
- Use Undo, Reset or Solution when you want help.
Hashi rules and solving strategies
Start with high numbers. An island with a 7 or 8 has very little freedom because each visible neighbour can take only two bridges. Corners and edge islands are especially revealing because they have fewer possible directions.
Next, look for forced connections. If an island needs almost all of its maximum bridge capacity, several routes must be used. If a route would split the puzzle into a closed island group too early, it cannot be the final move.
- Count the maximum bridge capacity around each island.
- Force bridges when an island's clue equals its remaining capacity.
- Avoid creating a small closed network before all islands are connected.
- Use double bridges carefully because they consume capacity quickly.
- Remember that a bridge blocks every crossing route.
Grid sizes and difficulty levels
The 7x7 Hashi grid is best for beginners and quick games. The 9x9 grid adds more islands and more possible bridge routes, while the 11x11 grid creates a larger Bridges puzzle for longer sessions.
Difficulty changes the island count, the number of double bridges in the hidden solution, and how many tempting routes the solver must rule out. Easy puzzles tend to have more obvious forced bridges. Hard puzzles ask you to combine counting, crossings and connectivity.
- Easy: smaller networks and more direct island clues.
- Medium: a balanced Hashi puzzle with more branching.
- Hard: larger networks, fewer immediate starts and deeper bridge logic.
Unique Hashi puzzles
Every puzzle generated on this page is checked by a solver before it is shown. The generator builds a candidate island network, calculates the bridge clues, and then counts solutions. Only puzzles with exactly one solution are accepted.
That uniqueness check matters for serious Hashi play. A good Bridges puzzle should be solvable by logic, not guessing, and the final bridge network should be the only network that satisfies all island numbers.