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Put the numbers 1 through 9 into the circles so that every line (of any length, even uncontinous) contains every digit not more than once.

Put the numbers 1 through 9 into the circles so that every line (of any length, even uncontinous) contains every digit not more than once.

Fill in the grid so that every row, every column and both diagonals contain the digits 1 through 8.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 3. Each row, column, and 3x3 box contains three 1's, three 2's, and three 3's.

Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different.

Fill in the grid so that every row and every column contains each digits 1 through 5 exactly once. Starting from the left bottom corner there must be along the spiral the number order 1 - 2 - 3 - 4 - 1 - 2 - ... - 3 - 4 .

Fill in the grid so that every row, every column, and every marked 5 fields box contains the digits 1 through 5.

Example:

Puzzle:

Fill in the grid so that every row, every column, and every marked box contains the digits 1 through 4. Each row, column, and box contains one 1, two 2's, three 3's and four 4's. Orthogonally adjazent cells must have different digits.

Fill in the grid the numbers 1 through 9 so that in every row, every column (even if it is not continous) and in cells of the same color no number is repeated. There are no neighbouring cells with consecutive numbers.

Fill in the grid so that every row, every column and both diagonals contain the digits 1 through 7.