Logic Masters Deutschland e.V.

Rules: Japanese Sum variant
1. Place the numbers 1-7 in every cell such that no number repeats in any row/column.
2. Circle 7 distinct numbers (1-7) such that exactly one number is circled in every row/column.
3. Each circled number divides the row/column into two sections, those before and those after the circle. Numbers outside the grid indicate the sum of one of those sections. It is possible for one of the sections to be empty. Its sum would be 0.
4. Draw a snake that visits all the circled numbers in order, starting with 1 and ending at 7. A snake is an orthogonally connected path that never touches itself, not even diagonally.
5. The circled numbers divide the snake into six non-empty segments. The six sums of the segments must form, in some order, six consecutive numbers.



You can solve the puzzle here.

This is one of 12 disjoint puzzles I made this year with varying styles/difficulties themed around snakes and 2025.
Enjoy!