Design by William Strijbos

This puzzle looks very easy on first sight, because it is no problem to put sixteen blocks with a size of 1 x 2 x 2 units in a box with a size of 4 x 4 x 4 units. The aim of this puzzle is a little more complicated. Is it possible to put fifteen blocks in the box in such a way that if the box is closed and shaken the blocks will be kept on place. If you put sixteen blocks in the box and than simply take one away you get an illegal solution because the blocks will move if you shake the box. When you have found the solution with fifteen block try the same with fourteen, thirteen or twelve blocks. Is it also possible to put eleven or even ten blocks into the box without moving the blocks when you shake the box? 

This puzzle is also named 'Anti slide' and designed by William Strijbos