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Fill in the grid the digits 1 through 7 so that no row, column, and diagonal contains any digits more then once. Different colors help to spot the diagonals.

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 - 5 - 1 - 2 - ... - 4 - 5.

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 - 5 - 1 - 2 - ... - 4 - 5.

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 - 5 - 1 - 2 - ... - 4 - 5.

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 - 5 - 1 - 2 - ... - 4 - 5.

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 3x2 box contains the digits 1 through 3. Each row, column, and 3x2 box contains one 1, two 2's, and three 3's.

Fill in the grid so that every of the nine marked 3x3 box contains the digits 1 through 9. No digit can repeat in a row or column.

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.

Put the numbers 0 through 9 into the triangular cells so that every line (of any length, in three directions) contains every digit not more than once.