Oh the fun of learning without knowing that you are learning... I think I will call is "Sneaky School".
Take this game for instance...
The object of the game is to see how many cylinders you can pile on either side of the clown (as well as on his head) before it falls over.
It can be played by 1-4 players.
Love an activity that can be individual or group.
It teaches counting, balance, geometry, colors and good old fashion fair play. And my kids don't even know that they are being educated... buahahahaha.