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Fill in the cells of the grid the digits 1 through 6 so that every row, every column, and every of the four marked triangles contains the digits 1 through 6.

Example:

Puzzle:

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 0 through 9. Some cells contain two digits.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 0 through 9. Some cells contain two digits.

Fill in the grid so that every row, every column and every marked 2 x 2 box contains the digits 1 through 8. In each cell the upper left triangle contains a digit that is less then the digit in the lower right part of the same cell.

Fill in the grid so that every row and every column contains the digits 1 through 8. Each box contains two numbers.

Fill in the grid so that every row, every column, and every colored region contains the digits 1 through 8 at most once.