While you are exploring Olympus in Kingdom Hearts 3 you might find the hidden forge. Check out this Kingdom Hearts 3 Olympus forge puzzle guide to get your reward from it. If you figure out the puzzle Goofy will be stronger for you.
Kingdom Hearts 3 Olympus Forge Puzzle Guide
When you finally get to the forge you will have to interact with the anvil. One trigger moves the orange fire quicker and the other trigger moves the yellow pot of fire quicker. Here is what you want to do. You want the yellow fire pot to be close to the white fire pot but not on it. Then you slowly move the orange fire pot closer and closer to the white fire pot. If the yellow fire pot gets to close to the white fire pot then move the yellow pot away a bit. You need them all to line up at the same time. This picture is what you are aiming for.
Once you get the fire down to the anvil you can collect your item from there and head on out. Check back soon for more Kingdom Hearts 3 guides.