Logic Masters Deutschland e.V.

The standard palindrome line is so boring and grey. Palindromes should get a chance to dress up in the wonderful myriad of colours that the other line constraints get. Consensus testing estimate was a solid 3 stars, despite me making a total hash of my test solves and thinking it was harder. Good luck!

• Normal sudoku rules apply: Place the digits 1 to 9 once each in every row, column, and 3x3 box
• All lines in the grid are palindromes, which must read the same forward as backwards
• In addition, each of the following constraints applies to exactly one line in the grid:
  • German Whispers: Adjacent digits must differ by at least 5
  • Parity: Adjacent cells must contain one odd and one even digit
  • Region Sum Line: Box borders divide the line into segments with the same sum
  • Ten Line: Must contain one or more non-overlapping contiguous groups of cells that sum to 10
  • Zipper: Digits an equal distance from the center of a zipper line must sum to the digit in the center

Play on Sudokupad

NB: The lines have been left hollow. In sudokupad the pen tool can be used to colour in the line when its type has been established.

Download full solution guide (PDF)