Roller derby leagues all over the US compete under different rules. The general idea is always the same, but many derby leagues have small variations.

For inter-league bouts and tournaments, the Women's Flat Track Derby Association (WFTDA) has put together a set of official rules. Click the links below to read up so you know why that chick is standing in the penalty box. Or why that guy keeps blowing his whistle at you.

Appendix D - WFTDA Track Design