Section 2: Equipment
The Ball
- Type: Standard rubber playground ball (also called a kickball or utility ball)
- Size: 8.5 inches (21.6 cm) in diameter is the standard; 10-inch balls are acceptable for younger players
- Material: Inflatable rubber with a textured surface for grip
- Inflation: The ball should bounce to approximately waist height when dropped from shoulder height on the playing surface. Over-inflated balls are dangerous; under-inflated balls are difficult to control
- Color: Traditional red is most common, though any color is acceptable. Competitive tournaments may specify official ball brands
Court Marking Materials
- Chalk: Standard sidewalk chalk for concrete or asphalt surfaces. Lines should be clearly visible and approximately 1-2 inches wide
- Tape: Painter's tape or court-marking tape for indoor gymnasium floors. Duct tape may be used on outdoor surfaces for more permanent markings
- Paint: Many schoolyards and parks have permanently painted Four Square courts. Semi-gloss outdoor paint is recommended for longevity
- Pre-made mats: Portable rubber Four Square mats are available for use on grass or uneven surfaces
Playing Surface
- Preferred: Smooth concrete, asphalt, or sealed gymnasium flooring
- Acceptable: Rubber sport court surfaces, outdoor basketball courts, tennis courts
- Not recommended: Grass, gravel, sand, or any surface where the ball does not bounce consistently
Optional Equipment
- Numbered markers: Cones or signs labeled 1-4 (or King, Queen, Jack, Peasant) placed in each square
- Spare balls: At least one backup ball in case the primary ball is damaged or lost
- Whistle: For organized play with a referee