Grudge classes are offered in all four divisions (Real SPL, All Around SPL, Demo Showdown, and Subsonic Suicide). No awards, just bragging rights. Competitors can challenge each other in any format with any equipment. Challenged competitor is not required to accept. Each competitor must throw down at least $5 to the judge, but can wager against each other on top of that. If competitors want to bet $20 against each other, they can. If competitors just want to run against each other, but are normally in separate classes, they can. Competitors can modify the rules of classes (i.e. make Subsonic 5 minutes long or make Real SPL door open). None of their scores are recorded officially, but they can brag about it and call out others. Basically a make your own format with no set rules where they can talk sh*t and settle it.