Go to Free Duel mode and use a deck that uses as many cards that reduce your opponents as possible. Set the rules so that you and your opponent's LP are 2,000. Then, play them all from your hand for an easy win. Do this against an Obelisk Blue Girl for a large bonus. Use Tremendous Fire, Restructor Revolution, Ookazi, Final Flame, Hinotama, and even Sparks to achieve this.