The Cuadrillas Elimination is where each group of four riders will spin a roulette of tricks one time (old-school tricks that are barely shown in competition). All riders have to pull out this trick within their 50-second run. The best two riders of each group qualify for the semi-final. At the completion of each rider's run, the judges award a score. When all riders in this round have completed a scored run, the scores are announced and the top scored rider advances through to the semi-final. Six riders are then qualified in pairs and battle head-to-head in the semi-final, in which there is no mandatory trick. Each rider takes his own run with a pre-determined time limit (75 seconds). The lower seeded rider in each pair ride first. Time starts when the rider takes his first jump. After each run, the rider goes a pre-designated position to watch his replays on the big screen. The second rider in the pair, who is not riding, will wait at the Hot Spot, remove his helmet and watch the other rider's run. After the second rider's run, both wait at a pre-designated position for the judges' decision of whom of the two is in the Final round. The winner from each battle would advance to the final.