The square needs the whole width. Hold your iPad the long way.
Throw the ball, dodge it, try to catch.
3 on 3 in a giant square. You can't cross the line in the middle. Pull back hard and the ball flies red hot — that one gets people out. A slow white ball gets caught, and a catch is the big one: whoever threw it is out, and one of the catcher's team comes back in. So never throw a soft one. A ball that has already bounced can't hurt anybody, so walk right through it. Last team standing wins.