Wheelchair basketball, created by disabled World War II veterans, is played on specially designed wheelchairs for the physically impaired. The world governing body of wheelchair basketball is the International Wheelchair Basketball Federation (IWBF).
Water basketball, played in a swimming pool, merges basketball and water polo rules.
Beach basketball, a modified version of basketball, played on beaches, was invented by Philip Bryant. Beach basketball is played in a circular court with no backboard on the goal, no out-of-bounds rule with the ball movement to be done via passes or 2½ steps, as dribbling is next to impossible on a soft surface.
Dunk Hoops (aka Dunk Ball) is a variation of the game of basketball, played on basketball hoops with lowered (under basketball regulation 10 feet) rims. It originated when the popularity of the slam dunk grew and was developed to create better chances for dunks with lowered rims and using altered goaltending rules.
Slamball is full-contact basketball, with trampolines. Points are scored by playing the ball through the net, as in basketball, though the point-scoring rules are modified. The main differences from the parent sport is the court; below the padded basketball rim andbackboard are four trampolines set into the floor which serve to propel players to great heights for slam dunks. The rules also permit some physical contact between the members of the four-player teams.
Streetball is a less formal variant of basketball, played on playgrounds and in gymnasiums across the world. Often only one half of the court is used, but otherwise the rules of the game are very similar to those of basketball. The number of participants in a game, or a run, may range from one defender and one person on offense (known as one on one) to two full teams of five each. Streetball is a very popular game worldwide, and some cities in the United States have organized streetball programs, such as midnight basketball. Many cities also host their own weekend-long streetball tournaments.
Unicycle basketball is played using a regulation basketball on a regular basketball court with the same rules, for example, one must dribble the ball whilst riding. There are a number of rules that are particular to unicycle basketball as well, for example, a player must have at least one foot on a pedal when in-bounding the ball. Unicycle basketball is usually played using 24" or smaller unicycles, and using plastic pedals, both to preserve the court and the players' shins. In North America, popular unicycle basketball games are organized.