I cant remember but I vaguely recall having to do them to boost my speed similar to Splashdown. the tricks in DD are hard to pull off because you need to press the shoulder buttons. Its somewhat easier in Splashdown but still annoying. honestly there are so many things going on in DD it can be hard to play. the only mercy given to you is that the AI is a little slower. so basically its like if someone chopped off on of your legs and told you to race against a guy who was gonna run at half speed