I really like this game. Its a great way to teach logic.  This version of Mastermind could be much improved.  The tray is not large enough to store all of the pegs.  The piece that covers the secret code is just in the way.  The tiny red and white pieces that you use to signal whether the player has guessed the correct color or placement of the pegs must be placed into tiny holes in a strange square configuration.  My elderly dad has trouble getting those pieces into the holes due to his eyesight.  I can think of a much better way to design this game.