Logic Masters Deutschland e.V.

"Keep out of the black and in the red; nothing in this game for two in a bed"

This puzzle began life as an experiment around using parity sweepers and insisting that the circles all contain different digits. I enjoyed the shading logic, and then tried to find a suitable disambiguator. As my brain is strange, this reminded me of the prize round from Bullseye (ask your parents). Good luck!

• Normal sudoku rules apply: Place the digit 1 to 9 once each in every row, column, and 3x3 box
• Parity Sweepers: A digit in a red circle counts how many of the up to 9 surrounding cells have the same parity as the digit in the circle, including counting itself. (E.g. if a circle contained a 6, then 5 of the 8 cells that touch orthogonally or diagonally must contain an even digit, in addition to counting the 6 itself)
• Not Parity Sweepers: A digit in a black square does not count how many of the up to 9 surrounding cells have the same parity as the digit in the square, including counting itself. (E.g. if a square contained a 6, then we must not have 5 of the cells that touch orthogonally or diagonally containing an even digit)
• Extra Region: Every circle contains a different digit. Every square contains a different digit

Play on Sudokupad

Download full solution guide (PDF)