Logic Masters Deutschland e.V.

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PUZZLE:

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RULES:

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Normal Sudoku rules apply
(i.e. fill the 9×9 grid so that every row, column and marked 3×3 box contains the digits 1-9 without repeats).

Normal Entropic, German Whisper, Modular, Region Sum and Thermometer line rules apply
(i.e. every three cells along an Entropic line must contain a low {1, 2, 3}, medium {4, 5, 6} and high {7, 8, 9} digit;
digits along a German Whisper line must differ by at least five [5];
every three cells along a Modular line must contain a remainder one {1, 4, 7}, remainder two {2, 5, 8} and remainder zero {7, 8, 9} digit, when divided by three;
box borders divide a Region Sum line into segments of equal sum;
digits along a Thermometer line must strictly increase from one end to the next).

Every line type appears once in the puzzle; it is up to the solver to determine the identity of each line.

Digits within a black Killer cage must sum to the number given in the upper-right corner;
a Little Killer clue outside the grid sums the digits along the indicated diagonal;
two cells separated by a white Kropki dot must contain consecutive digits;
two cells separated by a black Kropki dot must contain digits where one is double the other;
a grey fortress Maximum cell will contain a digit greater than its neighbours it points toward;
a grey fortress Minimum cell will contain a digit greater than its neighbours that point towards it;
digits appearing in a grey square must be Even;
digits appearing in a grey circle must be Odd;
a black Circle around a digit counts how many black Circles contain that digit.

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INTRODUCTION:

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This is part of another Scojo prompt - in which we were tasked with using only one of a given constraint - and has really opened my eyes to why people prefer fewer rules and succinct definitions. Enjoy!

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