Logic Masters Deutschland e.V.

3 years on, I present the sequel to A Mathematical Phenomenon!

• Normal Sudoku Rules apply.
• Outside clues are Sandwich Clues, indicating the sum of the cells between the lowest & highest values (usually 1 & 9) seen in their row or column. R0C0 applies this to each of Row 0 & Column 0 individually.
• Apart from value 0, every Sandwich Clue is unique.
• Cells across White Dots contain consecutive values.
• Cells across Black Dots contain one value double the other (1:2 ratio).

(If multiple instances of 0 are seen by R0C0's clue, which is 'lowest' is to be determined by the solver.)

Here's a suggested way of marking outside numbers on SudokuPad & F-Puzzles:

Hope you enjoy! 😄 - Any feedback or comments welcome!