I played the old Mousetrap with the little mice to move around the game.  The only thing that I can see is different now is that they don't have little mice with tails.  Instead, they have mice characters that stand up and look more like people walking.  Our kids love it! (9 yr old, two-4yr old girls).  The 4 year olds are able to put on all the pieces.  I always supervise them, however, because I want the game to last and it is very breakable.