I used to be quite good at that game. I have two large dragons sitting next to my bed that I won at Six Flags in Springfield. (I actually won three that day, but the third went to someone who gave me money to win a dragon for him)

I learned two important rules for playing that game. 1) Watch the game for a bit, and use the machine of someone who just won (you know the machine works properly), and 2) don't play against someone with three moles sticking out of their shirt.