1) Logic puzzle 
The Void Cube is a 3-D mechanical puzzle similar to a Rubik`s Cube, with the notable difference being that the center `cubes` are missing, which causes the puzzle to resemble a level 1 Menger sponge. The central `spider` used on the Rubik`s Cube is also absent, creating holes straight through the cube on all three axes. Due to the restricted...