Join the numbered islands with straight bridges: at most two per pair, none crossing, all connected
Hashi, short for hashiwokakero (build bridges), is a connection puzzle. The grid holds numbered circles called islands, and you join them with bridges. Bridges run in straight lines across or down, never diagonally, and only between two islands with nothing between them. Each island's number is how many bridges end at it, two islands can share one or two bridges, bridges may not cross each other, and when you finish every island must be linked into a single network. Ours grows a new set of islands each time and only shows a puzzle once its solver has proved there is exactly one way to build the bridges.
Pick a level: easy is a 7×7 grid with 8 to 10 islands, medium is 9×9 with 14 to 18, hard is 10×10 with 20 to 26.
Press New puzzle. Each circle is an island, and its number is how many bridges must touch it.
Tap one island, then tap another in the same row or column with nothing in between to build a bridge. Tap the same pair again for a second bridge, and a third time to remove both.
A bridge that would cross an existing bridge is refused; remove the other bridge first.
Islands turn green when they have exactly the bridges they need. With Show clashes on, an island with too many turns red.
On a keyboard, arrow keys move between islands, Space selects an island and Space on a second island links them, Escape cancels and Ctrl+Z undoes.
When every island has its number and they are all joined into one network, the puzzle ends and your time is saved as a best for that level.
Planning and global reasoning. Each island's number is a local rule, but the no-crossing rule and the need to connect everything make the whole map matter: one bridge can cut off another island's only route. Solving means counting how many bridges an island can still receive from each neighbour, spotting the forced ones, and checking that no group of islands gets closed off from the rest. It exercises arithmetic in small steps, spatial attention across a whole layout, and thinking a move or two ahead. Another logic game to try next: Akari (Light Up).
An island with one neighbour must send all its bridges to that neighbour; an 8 always takes two bridges in every direction.
Count capacity: an island with two neighbours can take at most four bridges. If it needs 4, both pairs get double bridges; if it needs 3, each neighbour gets at least one.
Two islands showing 1 can never be linked to each other, unless they are the only two islands, because they would form a closed pair.
Likewise, two 2s cannot share a double bridge: that would cut them off from everything else.
When a bridge is built, look along it: anything it crosses is now blocked, which may leave a nearby island with only one route.
Finished islands turn green; look at the islands that are still white and ask which neighbours they can still reach.
Hashi, or hashiwokakero, is a logic puzzle where you connect numbered islands with bridges. Bridges are straight and run horizontally or vertically, each pair of islands has at most two bridges, bridges do not cross, every island has as many bridges as its number, and all islands end up connected.
Yes. Bridges is the common English name for hashiwokakero. This game is our own build and not connected to any other version.
No. Bridges are only horizontal or vertical, and the game will not let you build one across an existing bridge.
That is part of the rules: the finished bridges must let you walk from any island to any other. It also rules out answers that would otherwise satisfy all the numbers, which is how the puzzle keeps a single solution.
Yes. The generator grows islands one by one along clear straight lines, adds a few extra bridges and sets each number to its bridge count. A solver then tries every possible bridge count between every pair of islands that can see each other, with the crossing, number and connection rules, and the layout is used only if it finds exactly one answer.
Grid size and the number of islands: easy is 7×7 with 8 to 10 islands, medium 9×9 with 14 to 18, hard 10×10 with 20 to 26. Each level keeps its own best time.
It is free with no sign-up. Your best time per level, the number of puzzles you have solved and the Show clashes setting are saved in this browser only.