Dotty Six

Watch this silent video to see the game being played.
Can you work out the rules?

You need a partner, a $1$-$6$ dice and a grid like this;

Take turns to throw the dice and draw that number of dots in one of the boxes on the grid.

Put all of your dots in one of the boxes. You can't split them up and you can't have more than six dots in a box.

When a box is full, you could put a tick in the corner like this:

 
Keep going until there are three ticks in a row or column or diagonal. The winner is the person who puts the last tick.  
 
Now, can you change the game to make your own version? 
 

Click here for a poster of this problem.