AndroChet

AndroChet is nice way to waste time during breaks or bus rides. It trains logical thinking and memory. In a 10x10 grid 5 invisible blocks are hidden. Probes, which are shot from the edges into the grid are reflected according to four simple rules:- probes can ricochet more than once- a direct hit gives a 180 degree reflection- hitting the edge gives a 90 degree reflection- direct hits on the edge makes the probe just vanishBy comparing entry and exit points the positions of the blocks are to be determined. The memory part is to use as few shots as possible, i.e. to remember, which path has already been checked.Have fun!