Gym class drill: who has the highest tower

The students all take a cube and pick a spot in the room.
You can only place your cube somewhere within the (usually yellow) volleyball field lines.
This way there is enough space between the cubes and the wall to play football.
The object of the game is to knock down someone's cube while defending your own.
Do you knock over someone's block? Then you can take 1 goat from him/her and place it on your block.
If you play this game correctly, you will get a tower and the winner will be the person who has the highest tower.
If a high tower is knocked down, only 1 block may be taken from it, not all of them.
When your last cube is knocked down, you may take a new one from the chest and rejoin the game.

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Balls