Logic Masters Deutschland e.V.

Normal 9x9 Sudoku: Place the digits 1-9 exactly once in every row, column, and 3x3 box.

Renban Lines: Purple lines in the grid are Renban lines. Digits on a line form a set of non-repeating, consecutive digits in any order.

Kropki Dots: Digits separated by a white dot are consecutive. Digits separated by a black dot have a 1:2 ratio, meaning one is exactly double the other. Not all dots are necessarily given.

X-Sums: Digits outside the grid indicate the sum of the first N digits, where N is the digit in the closest cell to the clue.

XV Sums: Digits separated by a V must sum to 5, and digits separated by an X must sum to 10. V and X are the Roman numerals for 5 and 10, respectively.

Minimum: Gray cells with arrows pointing inward must be smaller than all other cells that share an edge. You can think of the arrows like less-than signs, where the cell is less than the neighbors where a less-than sign appears.

Maximum: Gray cells with arrows pointing outward must be larger than all other cells that share an edge. You can think of the arrows like greater-than signs, where the cell is greater than the neighbors where a greater-than sign appears.