Logic Masters Deutschland e.V.

Rules:

• Normal Sudoku rules apply.
• Rotational pairs : Every digit, except the digit in the center (r5c5), has a 'partner digit' that is always placed 180° rotationally symmetrical to it, seen from the center of the grid. Which digits are paired up must be deduced by the solver. (Example: If the digits 1 and 2 turned out to be a rotational pair, and r2c4 is a 1, r8c6 must be a 2.)
• Lines are both modular and equal sum. Every set of three sequential digits along a line must contain a complete set of residues modulo 3, i.e. one digit from {1,4,7}, one from {2,5,8}, and one from {3,6,9}. The sum of the digits along a line within each 3x3 box it passes through are equal.
• Digits joined by a white dot are consecutives. Not all dots are given.

Play online using Sudoku Pad or F-Puzzles