0. The game ends when there is no more points to gain from the board.

1. If a peson completes a challenge, the square is "claimed" forever and gives 1 point.

2. If a person claims "5 in a row" figure, he gets 5 points.

3. If a person claims "4 in 2x2" figure, he gets 4 points.

4. A single claimed square can be part of several figures.

5. The person with most points wins.

Most challenges have specific definitions/restrictions/criteria, but I am too lazy to print out those.