Fill in the grid so that every ring, marked quarter and cells of the same color contains the digits 1 through 8.

Fill in the grid so that every ring and every green segment with its both yellow neighbors contains the digits 0 through 9 and the letters A and B. There is only one solution. You can find it by logic.

Fill in the grid so that every ring and every green segment with its both yellow neighbors contains the digits 0 through 9 and the letters A and B. There is only one solution. You can find it by logic.

Fill in the grid so that every ring, spoke, 3x3 box and every colored spiral contains the digits 1 through 9.

Put the numbers 1 through 7 into the hexagonal cells so that every line (of any length) and every zone of 7 cells marked by the rings contains every digit not more than once.

Example:

Puzzle:

Put the numbers 1 through 7 into the hexagonal cells so that every line (of any length) and every zone of 7 cells marked by the rings contains every digit not more than once.

Example:

Puzzle:

Put the numbers 1 through 7 into the hexagonal cells so that every line (of any length) and every zone of 7 cells marked by the rings contains every digit not more than once.

Example:

Puzzle:

Put the numbers 1 through 9 into the hexagonal cells so that every line (of any length) contains every digit not more than once. The greater less sign show in which cell the greater value is.

Smaller example with the numbers 1 through 6:

Puzzle:

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.