Joker Sudoku

Inspired by Prasanna Seshadri’s Joker Sudoku.

Play this on Penpa

Rules

1. Basic Sudoku rules applied.

2. Digits in a cage don't repeat.

3. Digits of the cells in a cage sums to the value on the top left corner of the cage.

4. Clues outside the grid equals to the sum of the digits of cells along the indicated diagonal. Digits can repeat along these diagonals.

5. One of the digits from 1~9 is Joker, when considering the clues of (3) and (4), the Joker never represents itself.

   • E.g, if Joker is 1, it always means another digit in 2~9 instead.

   • And Jokers can represent different digits in different equations.

6. Digits in clues are also digits. So rules also apply to them unless otherwise specified.