1. First, you need to have radar to navigate to the island.
2. Pufferfish can be found in the shallow waters around the island. Pufferfish will release venom at close range, so you need to use a bow and arrow to shoot them from a distance.
3. After killing, you can get explosive sticky substance and put it on the furnace for baking.
4. Wait for a while to pick up the explosive powder.
