Proton: As a solitaire puzzle, it's entertaining to come up different patterns to complete. http://www.boardgamegeek.com/image/334802 Proton: The back of the game. http://www.boardgamegeek.com/image/225117 Proton: Proton in original packaging, rear http://www.boardgamegeek.com/image/186985 Proton: Proton in original packaging, front http://www.boardgamegeek.com/image/186983 Proton: Rubikon -- Proton in the third dimension! http://www.boardgamegeek.com/image/80996 Proton: http://www.boardgamegeek.com/image/5022