Hashiwokakero
Connect numbered islands with bridges to form a single connected group.
Rules
- Each island displays a number indicating exactly how many bridges must connect to it.
- Bridges run horizontally or vertically between adjacent islands.
- Each pair of islands can be connected by a single or double bridge, but bridges may never cross.
- The puzzle is solved when every island has the correct number of bridges and all islands form one connected group.
Controls
Navigation Mode
| Key | Action |
|---|---|
Arrows / wasd / hjkl |
Jump to nearest island |
Mouse left-click |
Focus a clicked island |
Enter / Space |
Select island |
Bridge Mode
After selecting an island, you enter Bridge Mode.
| Key | Action |
|---|---|
Arrows / wasd / hjkl |
Build or cycle bridge in direction |
Enter / Space |
Deselect island |
Pressing a direction once builds a single bridge, twice upgrades to a double bridge, and a third time removes it.
| Key | Action |
|---|---|
Ctrl+R |
Reset puzzle |
Ctrl+H |
Toggle full help |
Escape |
Return to main menu |
Tips
- Start with extremes. Islands showing their maximum value (like an
8in the interior or a4in a corner) have only one valid configuration -- fill those in first. - Look for forced connections. An island with only one neighboring island in each required direction has no choice; those bridges are guaranteed.
- Work from the edges inward. Corner and border islands have fewer possible neighbors, making them easier to solve early and giving you constraints to propagate.