Logic Masters Deutschland e.V.

Rules:

• Classic Sudoku: Every row, column and 3x3 box must contain every number from 1 to 9.
• Ships: A ship is an orthogonal line of two or more cells, holding consecutive digits in ascending or descending order.
  • An N-ship is a ship made of N cells in a vertical or horizontal line. For example, a 3-ship could contain 234 or 876 (among other options) in order, vertically or horizontally.
  • The grid contains exactly one 6-ship, one 5-ship, one 4-ship, one 3-ship, and one 2-ship.
  • No other ships can be found on the grid – i.e. orthogonally adjacent cells are consecutive if and only if they belong to one of the listed ships.
  • Ships cannot touch, even diagonally.
• Givens: Every given digit is a “missed shot” – i.e. no given is part of a ship.

Solve online: SudokuPad

Example: The 6x6 grid below follows the same rules on a smaller scale: boxes are 2x3, the digits are 1 to 6, and the fleet is exactly two 2-ships. Its solution is on the right with the ship cells shaded.

Example	Solution

The two ships are 3–4 in column 2 and 4–3 in column 5, both in rows 3 and 4. No other pair of orthogonally adjacent cells holds consecutive digits, the ships do not touch, and none of the four givens is a ship cell.

Try the example in SudokuPad