Logic Masters Deutschland e.V.

Richard and I have created a fresh sudoku advent calendar in which we combine a well known variant with a relatively unknown variant every day. Combining variants leads to interesting and surprising new solving techniques.

Logically solvable
All puzzles can be solved completely logically although the logic is sometimes well hidden and is inherent to the combination of restrictions that the different types offer. For that reason we have written some solving hints for most of the puzzles, published in a very tiny font. If you want to read the hints, simply copy these in a text editor and enlarge the font size.

Next to Nine
Place the digits from 1 to 9 in every row, column and 3x3-block. Digits outside the grid are all the direct neighbours of the 9 in the respective row or column.

Maxed Squares
Arrows are present between two diagonally adjacent squares. In the square pointed at by the arrow, all digits are greater than the digits in their corresponding positions in the other square. Numbers may repeat in squares.