There are a lot of custom calls for 4 square. Some being.
King's Advantage. The king can serve the ball any way he likes. Sun Ball. The king may toss the ball up in the air, making it hard to play. Scrape. If the ball hits the edge of a square the play is redone. Cheep serves. The king may only do this twice. He can low serve the ball. Wall Ball. The player can hit the ball against a wall to hit a square. Immortal. Every player gets 2 lives but king. Gotcha's. Any player can catch the ball before it hits there square and yell gotcha's. If he does not yell gotcha's in the first 5 second he is out.