The rules of basketball vary depending on the level of play and the league. In international play, the rules are instituted by FIBA, the International Basketball Federation. Games that take place during the FIBA World Cup or Olympics, for example, follow these rules, and are sometimes very different from those used in the NBA. It should be noted that the rules explained here are only meant to highlight the differences between the two rule sets, and that more rules that do not conflict exist for many of these sections.
An international game is 40 minutes long if there is no overtime and is split up into 10 minute quarters.
An international court's sidelines are each 91.86 feet (28 meters) long while its baselines are each 49.21 feet (15 meters) long.
The international three-point line is 21.65 feet (6.60 meters) in the corners and 22.15 feet (6.75 meters) around the rest of the arc from the center of the basket.
The restricted area in international play is an arc on the floor that extends slightly farther from the center of the basket at 4.1 feet (1.25 meters).
In international play, any player can touch the ball after it hits the rim, whether that means tipping it in or hitting it away.
The NBA allows zone defense, but no player can be in the lane for more than three seconds unless he is actively defending against an offensive player. This restriction makes effectively playing a zone defense difficult.
International play allows teams to play zone defenses with no restrictions.
The NBA allows each team to take seven total timeouts during a game before overtime. Timeouts, for the most part, may be used at any point in the game, but only a certain number can be taken into the end of regulation. Additionally, all timeouts are 75 seconds long and each team is given two timeouts for each overtime period. Moreover, both players and the team's coach can call a timeout when the ball is dead or that team has possession of the ball.
In international play, each team receives a total of five timeouts before overtime. However, only two may be used in the first half, and three in the second half. All time-outs are 60 seconds long, and only one timeout is given to each team at the start of an overtime period. Any unused timeout from the previous period is not to be carried over and is simply discarded. Finally, only the team's coach can call a timeout and he/she must do so when the game clock is stopped.
In the NBA, a jump ball in the middle of the court is used to start the game. The team that gains possession from that initial jump ball also receives possession of the ball at the beginning of the third quarter. The team that does not have possession from that first jump ball receives possession at the beginning of the second and fourth quarters. Any jump ball call results in the involved players participating in another jump ball to determine possession.
In international play, a game is started with a jump ball. The team that does not gain possession from the jump ball is awarded possession at the next jump ball call. In each subsequent jump ball call, possession is awarded in an alternating fashion between the two teams.
In the NBA, a team receives two foul shots when the opponent has either accumulated at least five team fouls in any given period or has fouled the team in the final two minutes of any period. Offensive and technical fouls are not counted towards this penalty.
In international play, a team only receives two foul shots when the opponent has accumulated at least five team fouls in any given period. Technicals fouls are counted toward this penalty, but offensive fouls are not.