Have you ever played the dot game? If not, you should. It's fun and simple. I used to play this game with my father when we were waiting for food in restaurants. Recently I introduced my eight year old son to the game when we were waiting for the girls to finish a dance class. He loved it. It's free, fun to play and good for logical thinking.
It's somewhat similar to tic-tac-toe in that you can play with a pencil and paper almost anywhere.
Here is an on-line version so you can get a better idea of how it is played. The Dot Game.
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Real Family Fun