This is my latest puzzle, it is a 3D 18x18 puzzle. Instead of having numbers arranged in rows and columns, they have been arranged in a stack of cubes. The pictures with the colored lines shows the paths the numbers follow in 3 different directions. The cells along these paths are like the rows and columns in a standard puzzle, each cell along a path must contain a different number from 1 to 18 with no number being used in more than one cell along each path.
Creating this puzzle was quite difficult and I am not completely happy with it, so I will probably not do another puzzle like this. I would be interested to know what you think of it.