WFDF Rulebook

Double disc court is a game played by two teams of two players each. Each team is charged with defending a court from the attack of the opponents. The purpose of the following rules is to provide a guideline which describes the way the game is played.

Guts is a sport played between two teams of one to five players each. The objective is to be the first team to score 21 points. To start play, each team lines up facing each other 14 m apart. Play is accomplished by a player attempting to throw the disc toward or at the opposing team and within the reach of at least 1 player of that team, in such a manner that the opposing team cannot make a clean catch.

Discathon is a race in which players throw their discs, one at at time, through a circuitous 1 km course defined by a series of "tests" and "mandatories," which are typically tall trees and poles. Each mandatory describes a required flight path. The discs thrown by the players shall traverse the entire course, although the players themselves need not follow any specific path. The object is to complete the course in the shortest time possible.

Field events is a general term used to classify individual disc sport events, namely: accuracy, distance, maximum time aloft (hereinafter referred to as "MTA"), throw, run and catch (hereinafter referred to as "TRC"), and self-caught flight (hereinafter referred to as "SCF"). The common link among the field events is the competitive measurement of a particular basic skill. 

Freestyle is creative movement with a flying disc. Competitive freestyle is a sport whereby a player or a team of two or three players perform a routine, which consists of a series of throws, catches and moves, done to music using one or more discs. 

The object of the game is to traverse a course from beginning to end in the fewest number of throws of the disc. Each consecutive throw is made from where the disc came to rest after the last throw. Score is determined by counting the number of throws made on each hole plus penalty throws and then summing all holes.

More inormation: http://www.pdga.com/rules