These are the amazing Logic Puzzles! They utilize one of the very first mathematical concepts, logic. Using deductive reasoning, you can figure out which piece goes where.
They can be a fidget and a game! If you are competing against someone, try playing to see who can solve it the fastest. Also, if you are alone, you can time yourself and try to beat records. If you are simply bored or simply want to kill time, take out the hardest cube and now you have something to do. You might try the Easy Puzzle one day, and get it in 30 seconds, but the next day you might get in 30 minutes (it has happened to me)! Oh, and the assembly? That is for you to figure out (or you could just copy the model photos).
Notes