I ran across this puzzle game Beam Box that is based on Black Box. Beam Box is inspired by BlackBox, a deductive game invented by Eric Solomon in the 1970's. Your goal is to discover the whereabouts of atoms in a black box, by sending rays of light in the box and observing if and where the rays emerge. This is a full-featured free game. Features: - Difficulty settings : multiple box sizes (from 6x6 to 12x12) and number of atoms (from 3 to 8) - High scores : be quick and clever to get a better score. - Quick game : a game lasts betwween 1 and 5 minutes according to the difficulty settings. Ideal when you have a few minutes. - When interrupted, Beam box saves your current game, and restores it when you come back. - Beginners can use a "Show ray's path" option to understand better the interactions between atoms and rays in the box. Visit http://www.iphone4free.eu/?lang=en-us for more information. I don't know how to do images - link to iTunes is here. Nicely done, and challenging if you like minefield types of games. And it is FREE.