KNS Puzzles offers the Bridges puzzles in the following formats:
7 x 7 - Level 1 - Level 2 - Level 3
10 x 10 - Level 1 - Level 2 - Level 3
15 x 15 - Level 1 - Level 2 - Level 3
20 x 20 - Level 1 - Level 2 - Level 3
25 x 25 - Level 1
Connect every island, such that any island can be reached from any other. Each island contains a number that shows you how many bridges leave that island. Up to two bridges can connect islands together. Bridges can only go horizontally or vertically and may not cross each other.
This is the start of the puzzle.
The 6 clues tell us that there are 6 bridges leaving these islands. But we know that the most bridges we can have to any other island is 2, so we must have 2 in all directions.
Since we can only have (at most) 2 bridges in each direction, we know that there must be at least 1 in each direction on a 3 clue in a corner.
There is only one way to complete this clue.
There is only one way to complete each of these clues.
There is only one way to complete each of these clues and the puzzle completes.
The complete puzzle and we can move from any island to any other.
These islands cannot connect otherwise we'd have an isolated section of puzzle.
These islands cannot connect otherwise we'd have an isolated section of puzzle.