The 4x4x4 King Snake Puzzle has 64 blocks ( vs. the 27 of its shorter 3x3x3 Snake puzzle cousin). The degree of difficulty climbs through the roof! Oh so tough! If you solve this in under 3 hours without the instructions, it would be quite impressive. This King pattern with the checkerboard blocks is very tough even though there are 2 possible solutions, as the cube colors give very little hints as to the correct solution path.