How is Ultimate Frisbee played?

The basics

A regulation field is 100 metres by 37 metres, with endzones 18 metres deep (see diagram). Each team has seven players on the pitch during play which begins with both teams lining up on the front of their respective endzone line. The defence throws [pulls] the disc to the offence. You score a goal if you catch the disc in the endzone that you are attacking. 

The disc may be advanced in any direction by completing a pass to a team-mate. Players may not run with the disc. The person with the disc [thrower] has ten seconds to throw the disc. The defender guarding the thrower [marker] counts out the stall count.

When a pass in not completed [e.g. out of bounds, drop, block, interception], the defence immediately takes possession of the disc and becomes the offence. This is called a ‘turnover’.
The game is noncontact — when contact between players does occur, it may be deemed a foul.

Spirit of the Game

Players are responsible for resolving their own disputes including foul and line calls. Spirit of the Game forms a central philosophy at the root of the sport. Here is a brief summary from the World Flying Disc Association (WFDF):

“All players are responsible for administering and adhering to the rules. Ultimate relies upon a Spirit of the Game that places the responsibility for fair play on every player. It is trusted that no player will intentionally break the rules; thus there are no harsh penalties for breaches, but rather a method for resuming play in a manner which simulates what would most likely have occurred had there been no breach. Highly competitive play is encouraged, but should never sacrifice the mutual respect between players, adherence to the agreed-upon rules of the game, or the basic joy of play.”

Essentially it is expected that players will:
• Know the rules
• Avoid fouls and body contact
• Be fair-minded and respectful
• Have a positive attitude
• Show self-control

Some useful links: