We got this for my 10 year old daughter for Christmas & although she is admittedly smart, the game doesn't seem as much of a challenge for her.  The same holds true for any adult player.  It hasn't taken more than six lines to solve any given puzzle.  However, my 7 year old loves it and is a bit more challenged, but will probably conquer the strategy pretty soon.  Still, a classic game with classic, good family fun.  I would buy it again and it was more appropriately priced at $[...].  The only drawback we've seen is that the colors of the pegs were kind of "off", as in not classic colors and they don't all fit in their storage area so they fall out when trying to store away.