Logic Masters Deutschland e.V.

Irregular sudoku : Place the digits 1 to 9 once in each row, column and 9-cell region. One of the regions is disconnected.

Little Killer : Clues outside the grid give the sum of digits along the indicated diagonal. Digits may repeat on a diagonal if allowed by other rules.

Arrows : Digits on an arrow sum to the digit in the attached circle. Digits may repeat on an arrow if allowed by other rules.

Play online : Sudokupad