Question

You have an unlimited supply of clear cubes and 5 blue cubes. Explain in detail why it is not possible to get a “+” shape, from every direction in a 3*3*3 large cube with only 5 blue cubes.

Answer 1

To make a solid blue plus sign takes up 7 cubes, The centre cubes not visible and so can be replaced with a clear cube. that makes the minimum 6