Essen 2013 Pylos
You take turns playing 1 ball onto the board.
When 4 balls make a square you can move a ball from the lowest level up on to the square to start the Pyramid.
If you make a square if 4 balls if your colour you get to take 2 balls back off the board.
Whoever places the ball on the top of the pyramid wins. If you run out of balls in your supply you lose.
Very simple, very fun.