Four wall paddleball, or paddleball, is a popular court sport in the Upper Midwest of the United States (particularly in Michigan and Wisconsin), on the West Coast of the U.S. (particularly in southern California) and in the Memphis, Tennessee area. It is played with a paddle and small rubber ball on a standard American handball or racquetball court, with similar rules to those sports.
Racquetball is a racquet sport and a team sport played with a hollow rubber ball on an indoor or outdoor court. Joseph Sobek invented the modern sport of racquetball in 1950, adding a stringed racquet to paddleball in order to increase velocity and control. Unlike most racquet sports, such as tennis and badminton, there is no net to hit the ball over, and, unlike squash, no tin (out of bounds area at the bottom of front wall) to hit the ball above. Also, the court's walls, floor, and ceiling are legal playing surfaces, with the exception of court-specific designated hinders being out-of-bounds. Racquetball is played between various players on a team who try to bounce the ball with the racquet onto the ground so it hits the wall, so that an opposing team's player cannot bounce it back to the wall.
The sport is similar to 40×20 American handball, which is played in many countries. It is also similar to the British sport Squash 57, which was called racketball before 2016.