Combining the non-stop movement and athletic endurance of soccer with the aerial passing skills of football, a game of Ultimate is played by two seven-player squads with a high-tech plastic disc on a field similar to football. The object of the game is to score by catching a pass in the opponent’s end zone. A player must stop running while in possession of the disc, but may pivot and pass to any of the other receivers on the field.

Ultimate is a transition game in which players move quickly from offense to defense on turnovers that occur with a dropped pass, an interception, a pass out of bounds, or when a player is caught holding the disc for more than ten seconds. Ultimate is governed by Spirit of the Game™, a tradition of sportsmanship that places the responsibility for fair play on the players rather than referees. Ultimate is played in more than 42 countries by hundreds of thousands of men and women, girls and boys.

As mentioned in the above descriptions, Ultimate is played under the principle of Spirit of the Game, to maintain sportsmanship in the game. The following are excerpts from the Official Rules of Ultimate: 11th Edition.

From the Preface:"The integrity of Ultimate depends on each player's responsibility to uphold the Spirit of the Game, and this responsibility should remain paramount."

From Section 1. Introduction, item B. "Spirit of the Game. Ultimate relies upon a spirit of sportsmanship that places the responsibility for fair play on the player. Highly competitive play is encouraged, but never at the expense of mutual respect among competitors, adherence to the agreed upon rules, or the basic joy of play. Protection of these vital elements serves to eliminate unsportsmanlike conduct from the Ultimate field. Such actions as taunting opposing players, dangerous aggression, belligerent intimidation, intentional infractions, or other 'win-at-all-costs' behavior are contrary to the Spirit of the Game and must be avoided by all players."

Spirit of the Game sets Ultimate apart from other competitive team sports. For over 30 years, Ultimate has flourished, reaching a highly competitive level, without the use of referees. In Ultimate, the honor system works. Sure, human nature rears its ugly head from time to time - just as in any sport, just as in life. Yet, one of the many beauties of Ultimate is how, even amid the most difficult of situations, utmost graciousness is allowed to meet that challenge head on. Through this balance, Ultimate players are free to demonstrate the most honorable and the most joyous sides of human nature in sport.

Most Ultimate players care deeply about Spirit of the Game. The organizational challenge for the UPA is to foster an environment where the challenge does not become,"to see what I can get away with". Rather than dictate what Spirit of the Game is or should be, it is up to each player to do so for him or herself within the context of the teams he or she plays with and against.