Every circle on the map is an island with a number, and that number is a promise: this many bridges end here. Your job is to keep every promise at once, without crossing any lines, and so that you can travel from any island to any other.
Bridges Island Puzzle unblocked is James Harvey's version written for Simon Tatham's Portable Puzzle Collection. Boards are generated fresh and checked by a solver, so each one can be finished with pure logic. It runs with a mouse, a keyboard or touch.
How to play Bridges Island Puzzle
Drag from an island toward a neighbor to lay a bridge. Do the same again to make it a double, and once more to clear it. Bridges only run straight across or straight up and down, and a pair of islands can share at most two of them.
A double bridge counts as two for both of its islands. Bridges can never cross each other. The puzzle is done when every island's count is exact and all the islands are joined into one connected group, and the map flashes to show it.
Pick a board from the Type menu, which has small, medium and large maps at three levels of difficulty. If something can no longer work, such as an island with too many bridges or one that can't reach its count, it turns red so you notice straight away.
Controls
| To… | Keyboard | Mouse | Touch |
|---|---|---|---|
| Build a bridge (repeat for a double, again to remove) | Ctrl + arrow, or Enter then an arrow | Drag from an island toward its neighbor | Drag from an island toward its neighbor |
| Mark two islands as not linked | Shift + arrow | Right-drag between islands | Press and hold an island, then drag |
| Mark an island as finished | Space, or Enter twice | Left-click the island | Tap the island |
| Jump to an island with a given number / show possible links | Number keys / G | — | — |
| New game, undo, redo | N, U, R | Menu buttons above the map | Menu buttons above the map |
Tips
- Start in the corners. An island tucked in a corner has two possible neighbors at most, so a high number there often forces double bridges.
- Compare the number to the neighbors. If the count equals twice the number of neighbors, every link must be a double.
- Avoid closed little groups. Joining two 1s, or two 2s with a double, seals them off from the rest of the map, which breaks the one-network rule.
- Mark links that can't exist. A no-link mark between two islands saves you from testing the same dead route again.
- Turn on the possible-links view when stuck. It shows every link still open, which makes forced moves stand out.
Bridges Island Puzzle questions
Can bridges form a loop?
In the normal rules, yes. A custom setting lets you ban loops, and boards built that way never need one.
Why would I lock an island?
Marking an island as finished freezes it and its bridges, so a stray drag can't undo good work. A second click or tap releases it.
Is it playable on a small phone screen?
Yes. You only need a short drag in the right direction, not a full swipe to the other island, so building bridges works fine on a small display.
