Logic Masters Deutschland e.V.

This puzzle is the continuation of my setting attempt during a speed setting event on the Sudoku Skunkworks Discord server. My puzzle was broken when setting time was over, but I continued working on it and eventually got to this version. I hope you enjoy!

Rules

• Normal Sudoku rules apply.


• Draw a one-cell-wide loop of orthogonally connected cells. The loop may not touch itself orthogonally, but may touch diagonally.


• Clues below the grid give the sum of digits on each horizontal and each vertical segment of the loop, including the cells on which the loop turns. A question mark (?) may represent any digit from 0 to 9, but for two-digit numbers, the first digit may not be 0. A hyphen (-) represents a single segment whose sum is unknown.


• Clues are given in the order of appearance along the loop. (An example is illustrated below.)


• The 2x2 area surrounding each white circle must contain cell(s) visited by the loop whose digits sum to 8. Additionally, cells that touch a white circle and aren't visited by the loop must contain a digit greater than 5.

Example Puzzle (6x6)

• SudokuPad
• Penpa+

In the example below, the pink cell denotes the starting point of the loop. From there the segment represented by the first clue goes upwards into C1. The digits on that segment sum to ?5, where the ? represents a 1. Then the next segment, which shares an endpoint with the first segment on R2C1, has digits with a sum of 6. Finally, after the loop passes through all segments represented by clues, it must go back to the pink cell. For the main puzzle, the starting point of the loop and the direction of sums along the loop must be determined by the solver.

Main Puzzle (9x9)

• SudokuPad
• Penpa+