From Jaap's Puzzle Page (with due credit and appreciation, https://www.jaapsch.net/puzzles/hexadec.htm):"The Hexadecimal Puzzle is the very first puzzle made by Binary Arts (now called Think Fun). Unlike all their later puzzles, this one is made of wood. It is closely related to their second puzzle, which was Spinout."It has a stationary base inside of which is a sliding carriage. On this sliding carriage are 8 switching bars. Each bar has two states, tilted up (0) or down (1). At the start they...