Spiral Sudoku

Penpa Link

rules

• Basic Sudoku rules applied.

• Thermometer Sudoku

  • Digits must increase along thermometers, bulb contains the smallest digit.

• Killer Sudoku

  • Digits in a killer cage must sum to the number in top left corner.

• Little Killer Sudoku

  • Digits along the indicated diagonal must sum to the given number.

  • Digits can repeat along the diagonal.