Since 2021, we have posted some extra difficult Sunday Stumpers, about once a month. These will be quite tough puzzles, but with a logical path to be found (and solution videos to help). This fifth Sunday Stumper of 2022 is a combination of Arrow Sudoku and Thermo-Sudoku by Jonas Gleim.
or solve online (using our beta test of Penpa-Edit tools)
Author/Opus: This is the 12th puzzle from guest contributor Jonas Gleim.
Difficulty: 5 stars
Time Standards (highlight to view): Grandmaster = 18:00, Master = 25:00, Expert = 50:00
Note: Follow this link for other classic Sudoku. If you are new to this puzzle type, here are our easiest Sudoku to get started on. More classic Sudoku puzzles can be found in The Art of Sudoku, The Art of Sudoku 2 and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.