Fill in the grids so that every yellow block has 8 white number cells arround the digits 1 through 8. Numbers must be placed according to greater (>) and less (<) signs.
Fill in the grid so that both rows contain the digits 1 through 9. In the circles there are no neighbouring cells with equal or consecutive digits.
Fill in the digits 1 to 6 in the empty cells so that around each black field each digit occurs exactly once. Digits in neighbouring cells must be different.
Fill in the triangles around each circle the digits 1 to 6 so that each digit is only used once per circle.
Fill in the triangles around each circle the digits 1 to 6 so that each digit is only used once per circle.