Diagonal Thermo Sudoku (Daily Sudoku League #68)

Diagonal Thermo Sudoku is an exciting Sudoku variation that combines two popular Sudoku concepts into a single puzzle. Along with the classic Sudoku rules, the digits on every thermometer must increase strictly from the round bulb to the flat end. In addition, the marked main diagonal must contain the digits 1 to 9 exactly once without any repetition. These two constraints work together to create many interesting logical deductions while keeping the rules simple and easy to understand.

This Sudoku variation was created as a practice puzzle for the Sudoku Grand Prix Championship, where similar puzzle types have appeared. By combining Thermo Sudoku with a diagonal constraint, the puzzle offers a fresh solving experience that rewards careful observation and logical deduction. If you enjoy Sudoku variants, this handcrafted puzzle is sure to provide an entertaining and satisfying challenge.

Rules of Diagonal Thermo Sudoku

Classic Sudoku Rules apply. Additionally, some thermometer shapes are in the grid; digits must be strictly increasing from the round bulb to the flat end. Also, numbers on the marked main diagonal do not repeat.