Logic Masters Deutschland e.V.

Normal sudoku rules apply; i.e. the digits 1 to 9 need to be placed, once each, in every row, column, and 3x3 box.

This grid is set on a torus, and only has 100 cells. This means that row 1 and row 11 are in fact the same row. The same is true of column 1 and column 11. Within the grid are 10- 3x3 boxes that must be found. This means that there are 10 cells in the grid that contain no digit. (Blank cells use a zero to solve uniquely)

Digits in a cage must sum to the number in the top left corner of that cage. Digits can not repeat inside a cage.

Digits along an arrow sum to the digit in that arrow’s circle.

The thin blue lines are region sum lines. Region borders divide these lines into equal sums, i.e. digits that appear on these lines sum to the same total in different regions. Different lines can have different totals.

Digits separated by a black dot have a 2:1 ratio, i.e. one is double the other.

Layered Sums