What Is Bridges (Hashiwokakero)?
Bridges, also known as Hashiwokakero or Hashi, first appeared in Nikoli in the early 1990s after an earlier form appeared in 1989. The Japanese name means 'build bridges.' Numbered islands need that exact number of bridge connections, and every island must belong to one connected network. Bridges run horizontally or vertically, never cross, and usually allow at most two between the same pair of islands. Start with forced islands, then connect the whole map.
How to Play Bridges (Hashiwokakero)
- Find numbered islands on the grid.
- Draw horizontal or vertical bridges between islands in the same row or column.
- Match each island's number with the exact number of bridges touching it.
- Use one or two bridges between a pair of islands, depending on the remaining count.
- Prevent bridges from crossing other bridges or passing through islands.
- Finish when every island is connected into one network.
Basic Rules
- Bridges must run straight horizontally or vertically.
- Bridges connect two distinct islands.
- No bridge may cross another bridge.
- No more than two bridges connect the same two islands.
- Each island must have exactly its printed number of bridges.
- All islands must be part of one connected group.
Strategy Tips for Beginners
- Start with high-number islands. An 8 with four neighbors must use two bridges in every direction.
- A 1 with only one possible neighbor must connect to that neighbor.
- Avoid closing a separate group too early. A completed cluster still fails if it cannot connect to the rest.
- Use maximum capacity. If an island needs 5 and has only three neighbors, at least one neighbor must receive two bridges.
- Mark impossible directions after a bridge blocks a path.
Real Examples of Gameplay
Forced Eight
An 8 island with neighbors up, down, left, and right must place two bridges in each direction.
Single Neighbor
A 2 island with only one visible neighbor must draw two bridges to that neighbor.
Connectivity Trap
Four islands can satisfy their numbers as a closed rectangle, but that would isolate them. Leave a connection route to the rest of the puzzle.
Variations of Bridges (Hashiwokakero)
- Slitherlink: Builds one loop from numbered edge clues.
- Nurikabe: Uses connectivity rules for islands and sea cells.
- Numberlink: Connects matching numbers with paths that cannot cross.
Why People Love Bridges (Hashiwokakero)
- The island numbers create strong opening deductions.
- Network connectivity adds a whole-board rule.
- The no-crossing rule makes every bridge placement matter.
- Large puzzles feel like building a map.
Play Bridges (Hashiwokakero) Online for Free
Play Bridges Hashiwokakero online for free. Draw bridge lines, satisfy island counts, and keep the full network connected from the first move to the last.
Comparison
| Version | Difficulty | Players | Typical Time |
|---|---|---|---|
| Small Bridges | Easy | 1 | 5 to 10 min |
| Standard Bridges | Medium | 1 | 10 to 20 min |
| Large Bridges | Hard | 1 | 20 to 35 min |
Frequently Asked Questions
Can bridges cross?
No. A bridge cannot cross another bridge or pass through an island.
Can two islands have three bridges between them?
No. The usual rule allows at most two bridges between the same pair.
Do all islands need to connect together?
Yes. Satisfying each number is not enough; the final bridge network must be connected.
Start Playing Now
Bridges is a network logic puzzle with clean rules and strong deductions. Build forced bridges, avoid crossings, and keep every island tied into one final map.