Logic Masters Deutschland e.V.

A puzzle made for Turn 1 of the Skunkworks League. The prompt was to set a Sudoku puzzle using a given grid, which involved these lines.

Rules:

Place the digits 1-9 exactly once in each row, column and box.

Draw a closed loop in the grid that moves from cell center to cell center, and doesn't visit the same cell more than once. The given grey lines are part of the loop. Apart from the given diagonal segments, the loop may only move horizontally or vertically.

Each complete straight segment of the loop (ie. a segment between two turns) must contain the digit equal to its length. This includes the given diagonal segments. (Note: The length of a segment is one less than the number of cells it visits.)

Clues above the grid indicate the sum of a complete vertical straight segment in the corresponding column. Clues to the left of the grid indicate the sum of a complete horizontal straight segment in the corresponding row. ?s stand for any digit 0-9, and leading zeros are allowed. (Eg. the clue "?4" could indicate a segment of sum 4, 14, 24, 34 or 44). In some rows and columns, only the parity of the corresponding sum is given. (Note: There may be multiple segments in a row or column, but only one of those has to sum to the clued total.)

CtC-App