Just Play Basketball (sick dunks, moves..)

The typical rules of "21" are:
one player "breaks" to begin the game by shooting from 3 point range. Sometimes players agree that the "break" must not be a successful shot, in order to give every player an equal chance at rebounding to gain the 1st possession of the game
the normal foul rule is in effect
baskets are scored as 2's and 3's (as opposed to 1's and 2's like Streetball)
after a successful shot, the shooter can take up to three 1-point free-throws, but as soon as he misses, the ball may be rebounded by anyone; conversely, if he makes all three free throw shots, he then gets to keep the ball and "check up" or start play again at the top of the arc
after any change of possession, the ball should be cleared past the 3 point line (or at times just out of the key)
in order to win, a player must make exactly 21 points; if he goes over then he restarts back at either 15, 13 or 11 points, depending on the rules in use
whoever wins the game starts with the ball at the beginning of the next game
only serious fouls are called (commonly referred to as "No blood, No foul")
other typical basketball rules, such as out-of-bounds are also frequently ignored in the game "21"; this is to avoid confusion on possession of the ball