Logic Masters Deutschland e.V.

A sequel of sorts to my previous Rainbow Palindromes where lines had multiple constraints. I thought Region Sum Lines might act as an interesting base constraint on which to add additional constraints which are to be determined by the solver. Consensus testing estimate was 3 stars. Good luck!

• Normal sudoku rules apply: Place the digits 1 to 9 once each on every row, column, and 3x3 box
• Every line in the grid is a region sum line, i.e. box borders divide the line into segments which have the same sum
• In addition, each of the following constraints applies to exactly one line in the grid:
  • Dutch Whisper: Adjacent digits must differ by at least 4
  • Entropic: Any run of three cells must contain one low (1, 2, 3), one medium (4, 5, 6), and one high (7, 8, 9) digit
  • Modular: Any run of three cells must contain three digits with different remainders when divided by 3, i.e. one from (1, 4, 7), one from (2, 5, 8), and one from (3, 6, 9)
  • Palindrome: Digits read the same forwards and backwards along the line
  • Parity: Adjacent cells must contain one odd and one even digit

Play in Sudokupad

Download full solution guide (PDF)