Logic Masters Deutschland e.V.

Normal Sudoku rules applies.

Arrow Rules: Digits along an arrow must sum to the value in the attached circle. Digits along arrows may repeat if allowed by other rules.

Squarer Rules: There are 9 squarers in the grid, which appear once in each row, column and 3x3 box. The nine squarer cells have to contain a complete set of the digits 1-9. Squarers are counted as the squared form of digits (e.g. squared 5 is 25) in that cell to satisfy arrow rules.

Links: CTC / F-puzzles