Because it is pleasant to be teased mentally with challenging puzzle I offer you two Hyper Sudoku 3D puzzles (Rules of Sudoku 3D) ? They have different shape and size, so your brain will be busy solving thes two puzzles. The first one is a combination of three cubes and you need to use numbers from 1 to 8. And to add more spice, the regions have irregular shapes. The last is a combination of three cubes but with greater size, so use numbers from 1 to 12.