Normal Sudoku rules apply. Each row, column, and 3x3 box contains each number from 1 to 9 exactly once.
Normal quadruple rules apply. The number in a quadruple constraint must appear in its four surrounding cells.
Arrow Sudoku rules apply. Digits along an arrow must sum to the digit in its circle. Digits may repeat along the arrows.
The puzzle is also available at f-puzzles.
Solution code: Row 2 then Column 8 (18 digits, no spaces)
on 30. January 2021, 20:36 by PseudoCoup
Excellent puzzle. Is there any way we can send this back to
the top of page 1??? :-)
on 27. January 2021, 02:23 by Gramor
Wundervoll.
on 26. January 2021, 21:37 by Tilberg
Sehr schöne Logik! Danke!