I picked up BeamBox for free yesterday and realized that I had downloaded a similar game previously but do not remember its name. I looked through my account history, but there is so much stuff there, nothing really jumped out. Basically, you are given a grid and by sending rays of light into the grid and observing where they exit the grid, you are supposed to determine where the atoms are in within the grid. I guess it's based on a game called BlackBox. Anyone have any idea what I'm talking about?
Well, there's Black Box - Atoms on the App Store, as well as other similar games like DarkBox, Black Box Touch, Beam Box, etc.
If you like Black Box and similar logic games, I'd recommend Puzzle Maniak, which contains Black Box and 19 others that, while may lack the polish of other implementations, include difficulty levels and unlimited random games...