Logic Masters Deutschland e.V.

• 1. Shade some cells (representing "water") such that:
  • 1a. The water cells form a single contiguous region, with no 2x2 areas.
  • 1b. Each orthogonally-connected group of unshaded cells (or "island") contains exactly two numeric clues (the two clues may occupy the same cell, indicated with smaller numbers in the corners of a cell), and one of those clues is the number of cells in that island.
  • 1c. All numbers are part of islands.
• 2. The other clue in each island is the number of bridges connecting that island to other islands.
  • 2a. A bridge is a straight line from a cell on one island to a cell on another island, with only water cells in between.
  • 2b. Bridges cannot turn, cannot cross one another, and cannot start or end on the same island cell as another bridge.
  • 2c. The bridges must join all the islands into one connected network.
  • 2d. Each pair of islands can have at most 2 bridges connecting them directly.
• 3. Some number clues have been replaced with question marks. These may represent any number.

• Penpa (Main Puzzle)
• Penpa (7x7 Example Puzzle)

Solution code: Row 8, notated as follows: A = Island cell with a bridge, B = Island cell with no bridge, C = water cell with a bridge, D = water cell without a bridge (in the 7x7 example puzzle, row 4 would be written as CDACABB)

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