- This is a competition game between two players.

- In turns, each player takes a number out of the window.
The numbers taken out cannot be put back.

- The number taken out has to be a multiple or factor of the number taken before and shown in the box.

- The player that takes out a wrong number or cannot take out a number loses.

- In order not to give the first player an advantage, the first number taken out must be an even number.