I recall a while back they were supplying a slightly smaller licensed version of the Uno game with their happy meal. I thought it was very clever because people of all ages like to play card games. Cards are quite cheap to produce and they're light weight and take up a small space so distributing it as a toy for a children's meal is very clever in my view.
I think it's good to play card games because it gets your mind thinking. They don't use electricity.
I like the way I can accumulate points and rewards and trade them in for free food items.