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Official Rules of the Sport
In the United States, ultimate is governed by USA Ultimate, and most of our games are played under their rules.  However, it's important to note that there are often slight variations to the rules adopted for league or tournament play.

The World Flying Disc Federation (WFDF) governs Ultimate internationally, and their rules are slightly different from the USA Ultimate's.
For the basics -- just enough to get started -- see the 10 Simple Rules of Ultimate.