Cube
A cube is represented by a series of squares. The first layer is given as a regular square with all its clues. The second layer begins with the second word of the first square and proceeds with its subsequent clues. The third layer begins with the third words of the first two squares and proceeds with its subsequent clues—and so on. The 3D effect can be seen in imagining the squares placed one on top of another in order. Then, for instance, the first clue of the first square is read across and down its square, and through the top left letters of each of the squares.