Logic Masters Deutschland e.V.

Due to your sudoku prowess, you have been tasked with surveying a collection of islands and building a network of bridges to connect them

Rules:

• Standard Sudoku rules: every row, column, and box contains the digits from 1 to 9 exactly once each.
• Islands: every cell of the grid is either part of an island or the ocean. Every concrete foundation and corner-clue lies on an island. Conversely, every island, which is necessarily an orthogonally connected cage, contains exactly one corner-clue (anywhere on the island). This corner-clue denotes the sum of all digits on the island. The digit occupying the cell containing the corner-clue is the size of the island. All digits on an island are distinct, and no two distinct islands may touch each other (orthogonally or diagonally).
• Ocean: the ocean is orthogonally connected.
• Bridges: Between any two islands, there is a sequence of islands and bridges that connect them. A bridge is a line (consisting of vertical, horizontal, or diagonal segments) whose endpoints must lie on concrete foundations. Besides their endpoints, bridges exclusively lie over ocean cells. No two bridges can share a cell (including endpoints) or cross over each other. A bridge is a palindrome line, that is, digits in the cells under a bridge form a palindrome along the bridge. Finally, a bridge cannot be built through the center of a windy cell.

Note: the win-condition is to correctly fill the grid with digits. The islands and digits are unique, but the bridges are not.