Bridges Island Puzzle Unblocked

Bridges Island Puzzle is a calm, number-driven logic game set on a map of small round islands. Each island shows a number, and that number is a promise: it says exactly how many bridges will end there. Your job is to keep every promise at once while making the whole archipelago reachable from any island. It is a long-standing pencil-and-paper format, and this unblocked browser build comes from James Harvey and Simon Tatham’s well-known portable puzzle collection.

Rules of the Archipelago

Bridges only run horizontally or vertically, in straight lines between two islands. They cannot bend, and they cannot cross another bridge. Any two islands can be joined by one bridge or by a pair of parallel bridges, never more, and a double counts as two for both ends.

You have solved the map when three conditions hold together:

• every island’s number equals the bridges touching it
• no two bridges cross anywhere
• all islands form a single connected group

The map flashes when you get there. Along the way, certain errors light up in red straight away: an island with too many bridges, one that can no longer reach its number because routes are blocked, or a cluster that has sealed itself off from the rest.

Bridges Island Puzzle controls

To do this	Keyboard	Mouse	Touch
Lay a bridge (again for a double, a third time to clear)	Ctrl + arrow, or Enter then an arrow	Drag from an island toward its neighbor	Drag from an island toward its neighbor
Mark a pair of islands that must not connect	Shift + arrow	Right-drag between islands	Press and hold an island, then drag
Lock an island you know is done	Space, or Enter twice	Left-click the island	Tap the island
Hop to an island by number / reveal possible links	Number keys / G	—	—
New puzzle, undo, redo	N, U, R	Menu buttons above the map	Menu buttons above the map

Solving Techniques, Easiest First

1. Forced doubles. If an island’s number is twice its count of possible neighbors, every link must be a double. Corners and edges are the usual places to spot this.
2. Near-forced singles. An island with three neighbors and the number 5 must send at least one bridge to each neighbor, since doubles to only two of them reach 4 at most.
3. Avoid closed pairs. Joining two 1s to each other cuts them off from the map. The same goes for two 2s joined by a double. Unless the board has only those two islands, that link is wrong.
4. Track what is left. After each bridge, recount the remaining need of nearby islands. One placement often unlocks a chain of others.
5. Use your notes. A non-link mark between two islands records that a route is ruled out, and locking an island that is complete protects it from stray drags.

When you are stuck, press G. Grey lines appear for every connection that is still possible, which often shows a single remaining route you had overlooked.

Customizing the Challenge

The Type menu is where this version shines. Beyond the nine presets, you can ban loops, which means a ring of bridges counts as an error and generated boards are guaranteed solvable without one. You can also raise the limit to four bridges per direction for wilder maps.

If you enjoy network-style logic, try Net Pipe Puzzle next, or Loopy Loop Puzzle for another clue-driven grid from the same family.