Make a bridge-sum puzzle
Four islands, four reversible bridges. Set a target for each island, test whether your puzzle works, then send someone a fresh board with your targets.
Design the board
Choose the total each island should receive from its two touching bridge ends. To try the example, leave the four targets as they are.
Play the ring
A connects to B, B to C, C to D, and D back to A. Flip a bridge to swap its two numbers. Match the four targets at the same time.
Keep puzzling on iPhone
This maker creates independent browser boards. Number Puzzles: Sumbriska uses reversible numbered bridges and island targets in the iPhone game. For a guided start, try the six-board practice lab.
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