This is a documentation for Board Game Arena: play board games online !
Gamehelpquatrix
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Line up 4 pieces of your color in any direction or capture 4 squares of the same color.
If you play an X, your opponent must play a piece of their choice in one of the diagonal directions from played cell.
If you play a □, your opponent must play a piece of their choice in one of the orthogonal directions from the played cell.
If there are no more valid spaces, you may play anywhere you like.