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.