Fill in the grid so that every with an arrow marked line and every bold marked region contains the digits 1 through 8.

The coloured lines in this grid should help to understand the rules:

Fill in the cube so that every outlined region and every layer (as shown by the double arrows) contains the digits 1 through 8.

Fill in the cube so that every outlined region and every layer (as shown by the double arrows) contains the digits 1 through 8.

Fill in the grid the digits 1 through 9 so that in every row, every column (even if it is not continous) and in cells of the same color no digit is repeated.

Fill in the grid so that every ring, antipod cell group pairs and cells of the same color contain the numbers 1 through 12.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The sum of the connected pairs is 10.

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box will have exactly one of each digit. The red points in the near of crosses where four cells meet each other show that the cell with the red points is greater then the three other ones.

Fill in the grid so that every row, every column and 3x3 box contain the digits 1 through 9. All knights attack at least one other cell with the same number in the chess knight distance. The numbers at the left and at the top are the sum of cells with a knight.

Smaller Example:

Puzzle:

Fill in the grid so that every row, every column and 3x3 box contain the digits 1 through 9. All knights attack at least one other cell with the same number in the chess knight distance. The numbers at the left and at the top are the sum of cells with a knight.

Smaller 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 lines must contain consecutive numbers, i. e., if a line has five cells there can be 2, 3, 4, 5, 6 or 3, 5, 4, 2, 6 but not 3, 4, 1, 9, 8 in the cells.

Smaller example with the numbers 1 through 6:

Puzzle: