If you feel hard to understand this video! Here is a guide! 1. Go to your highest island. 2.. Stand as close as you can to the shop but don't open it. 3. Wait for the duel to start. 4. After the duel click yes and move forward to the shop AT THE SAME TIME! [for some people it might not work in that case when the duel start click yes and wait for just half a second or even less then after go forward. do this and it should work!] 5. Then click the rank you want to buy. 6. Make sure there are player in the duel. 7. Make sure not to close the shop and you can grind Swords,belts and rank from here continuously. 8. After the duel ends you will be teleport back to your highest island!!! (You can repeat it as many times as you want!!!)