What is Hashiwokakero (Number Bridges)?

Hashiwokakero is a Japanese logic puzzle where numbered islands on a grid must be connected by horizontal or vertical bridges. Each island's number indicates exactly how many bridges connect to it. All islands must form one connected group.

Can bridges cross each other in Number Bridges?

No. Bridges cannot cross other bridges or pass through islands. Each bridge must be a clear horizontal or vertical path between two adjacent islands.

🌉 Number Bridges

Connect numbered islands with bridges. Each island's number must equal its total bridge connections.

7x7 Easy · Puzzle ID: 0000000

In progress

Click an island to select it, then click a neighbor in the same row or column to build a bridge.

Featured Puzzle Shop

Number Bridges Game Introduction

Overview

Number Bridges, also known as Hashiwokakero or simply Hashi, is a classic Japanese logic puzzle. The goal is to connect all numbered islands on a grid using horizontal and vertical bridges, where each island's number indicates exactly how many bridges must connect to it. All islands must form a single connected group when the puzzle is complete.

Rules

Islands are circles containing a number from 1 to 8.
Bridges can only be drawn horizontally or vertically between two islands.
Each island's number must equal the total number of bridges connected to it.
A maximum of 2 bridges can connect any pair of adjacent islands.
Bridges cannot cross other bridges or pass through other islands.
All islands must be connected as one single group (no isolated clusters).

Controls

Click an island to select it. A golden glow indicates the selected island.
Click another island in the same row or column to create or cycle bridges between them.
Bridge cycling: 0 bridges, 1 bridge, 2 bridges, then back to 0.
Click the selected island again or click empty space to deselect.
Use Check to verify your current solution.
Use Hint to reveal one correct bridge connection.

Scoring

Track your progress by time. Solve puzzles faster on harder difficulties for a greater challenge. The timer starts when a new puzzle is generated and pauses when you complete it.

Tips

Start with islands whose number equals the maximum possible bridges. For example, a corner island with value 4 must have 2 bridges in each direction.
Islands with value 1 can only connect to one neighbor, which narrows down possibilities.
If an island has only one possible neighbor remaining, the bridge count is determined.
Watch for islands that would become isolated. Connectivity is a key constraint.
Use the Check button to find errors early before they cascade.

FAQ

What is Hashiwokakero? Hashiwokakero (literally "build bridges") is a Japanese logic puzzle invented by Nikoli. It is also known as Hashi, Bridges, or Number Bridges.

Can bridges cross each other? No. Bridges cannot cross other bridges or pass through islands. Each bridge must have a clear path.

How many bridges can connect two islands? A maximum of 2 bridges can connect any pair of adjacent islands.