I bought this to play with my grandkids at Thanksgiving, ages 7,6,6,5.  Once they learned the rules (we played the easy version)..they played for an hour straight. Later in the day, they played for another hour by themselves.  I'm a teacher and I love the thinking challenges in this game... memorization of card locations, addition, and knowing when to call an end to the game. It's quick, easy, and fun. Overall, an A+!