Free rolls are tournaments or other casino events that don't require the player to pay to play (and often have cash prizes for top players). This method is used to entice players to try out a certain casino, as well as keep amateur players interested in the activity. Some casinos have special free-roll events for existing members only, while others allow anyone to sign up and partake in a free roll event. Free rolls are another positive promotional opportunity for affiliates because the casino will usually pay a good commission just to try to get that player on board; however if you're promoting mostly free rolls, try to choose casinos that pay per player rather than on a RevShare basis.