Enter numbers from 1 through 4 into the diagram, such that on all sides of the cube in every row, every column and every bold bordered area every digit appears exactly once. Additionally, the digit on the common edge of two sides must be the same number.

Enter numbers from 1 through 4 into the diagram, such that on all sides of the cube in every row, every column and every bold bordered area every digit appears exactly once. Additionally, the digit on the common edge of two sides must be the same number.

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 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 cube so that every outlined region and every layer (as shown by the double arrows) contains the numbers 1 through 12.