This is a minor variation on Wall Ball. We played with the rule that the person who got three outs (strikes) had to go to the wall and get pelted. We also gave the person who had to touch the wall an out if they were pelted before they touched the wall. We also allowed someone to throw the ball at another player, but then both had to run and touch the wall before someone threw the ball at the wall or one of the two people. One hint: racquetballs are much harder than tennis balls. As an adult I described the rules to friends who had never played it and I got some weird looks. I now realize it is rather sadistic, but it didn't seem unusual as a kid. I played a game a few years back and it was still fun.
When the ball contacts the floor within the court boundaries or an error is made, the team that did not make the error is awarded a point, whether they served the ball or not. If the ball hits the line, the ball is counted as in. The team that won the point serves for the next point. If the team that won the point served in the previous point, the same player serves again. If the team that won the point did not serve the previous point, the players of the serving team rotate their position on the court in a clockwise manner. The game continues, with the first team to score 25 points by a two-point margin awarded the set. Matches are best-of-five sets and the fifth set, if necessary, is usually played to 15 points. (Scoring differs between leagues, tournaments, and levels; high schools sometimes play best-of-three to 25; in the NCAA matches are played best-of-five to 25 as of the 2008 season.)