Hashiwokakero

Connect islands with bridges to form a single connected group.

How to Play

Islands are numbered circles on the grid. Each number indicates how many bridges must connect to that island. Bridges run horizontally or vertically between adjacent islands, may not cross, and can be single or double. The puzzle is solved when every island has exactly the required number of bridges and all islands are connected.

1. Navigate to an island and press Enter or Space to select it.
2. Press an arrow key toward an adjacent island to build a bridge.
3. Press the same direction again to upgrade to a double bridge, or a third time to remove the bridge.
4. Press Enter or Space again to deselect.

Controls

Navigation Mode

Key	Action
Arrow keys / WASD / hjkl	Jump to nearest island
Mouse left-click	Focus a clicked island
Enter / Space	Select island for bridging
Ctrl+R	Reset puzzle
Ctrl+H	Toggle full help
Escape	Return to main menu

Bridge Mode (after selecting an island)

Key	Action
Arrow keys / WASD / hjkl	Build or cycle bridge in direction
Enter / Space	Deselect island

Modes

Mode	Grid	Islands	Description
Easy 7x7	7x7	8-10	Small grid, few islands
Medium 7x7	7x7	12-15	Moderate density
Hard 7x7	7x7	17-20	Dense island placement
Easy 9x9	9x9	12-16	Larger grid, spread out
Medium 9x9	9x9	20-24	Moderate density
Hard 9x9	9x9	28-32	Dense island placement
Easy 11x11	11x11	18-24	Large grid, spread out
Medium 11x11	11x11	30-36	Moderate density
Hard 11x11	11x11	42-48	Dense island placement
Easy 13x13	13x13	25-34	Largest grid, spread out
Medium 13x13	13x13	42-51	Moderate density
Hard 13x13	13x13	59-68	Dense island placement

Elo Difficulty

Named modes are compatibility presets. Use --difficulty <0..3000> to target a specific Elo difficulty for generated puzzles.

Quick Start

puzzletea new hashi easy-7x7
puzzletea new hashi medium-9x9
puzzletea new hashi hard-13x13