You are trying to win majority on the most boxes
Place a marble on a space in the row or column of the previously placed marble but not on its or the previous marble's box.
The game ends when no more marbles can be placed
If you got majority on a box you score points equal to its size
e.g. a box sized of 6 where you have 4 marbles and opponent has 2 marbles would score you 6 points