Setup and opening position
Four numbered islands occupy the corners of a 4×4 field. The four horizontal or vertical links around the perimeter begin undecided and each may contain zero, one, or two parallel bridges.
Bridges Puzzle
Set all four links to the unique connected arrangement that gives every island degree two.
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How to play
Set all four links to the unique connected arrangement that gives every island degree two.
- Four numbered islands occupy the corners of a 4×4 field. The four horizontal or vertical links around the perimeter begin undecided and each may contain zero, one, or two parallel bridges.
- The number on an island is the total bridge count touching it. A chosen set must meet all four degree totals and connect every island into one network; a double bridge counts twice at each end.
- Set all four links to the unique connected arrangement that gives every island degree two.
Strategy tips
- Compare an island's remaining degree with its undecided links. If one link cannot carry the entire remainder without disconnecting the network, the other link must stay active.
- Two parallel bridges between one pair satisfy two degrees locally but can leave that pair disconnected from the other islands.
- Check connectivity separately after the arithmetic balances, because correct island totals alone do not prove that all islands communicate.
Complete guide
Rules, scoring, and strategy
Bridges Puzzle is a complete browser implementation with its own versioned rules profile. Connect four corner islands into one network while giving every island exactly two bridges.
Legal moves and game flow
The number on an island is the total bridge count touching it. A chosen set must meet all four degree totals and connect every island into one network; a double bridge counts twice at each end.
Winning and terminal positions
Set all four links to the unique connected arrangement that gives every island degree two. Check connectivity separately after the arithmetic balances, because correct island totals alone do not prove that all islands communicate.
Practical strategy
Compare an island's remaining degree with its undecided links. If one link cannot carry the entire remainder without disconnecting the network, the other link must stay active. Two parallel bridges between one pair satisfy two degrees locally but can leave that pair disconnected from the other islands.
Questions players ask
What is the objective in Bridges Puzzle?
Set all four links to the unique connected arrangement that gives every island degree two.
Which moves are legal in Bridges Puzzle?
The number on an island is the total bridge count touching it. A chosen set must meet all four degree totals and connect every island into one network; a double bridge counts twice at each end.
What should I plan first in Bridges Puzzle?
Compare an island's remaining degree with its undecided links. If one link cannot carry the entire remainder without disconnecting the network, the other link must stay active.