New episode of the series Golden Sun, Golden Sun: Dark Dawn will put a strain on your brain with lots of puzzles based on the use of Psynergie. Here are a few ways to circumvent the difficult passages with cunning and without codes.
For the Flute:
The flute is in the village Corridor, which is the Alchemy Blacksmithing. The first time you're stuck trying to reach the ruins of the mountain Tongari, go to the Forge and use a fireball to light it. Then follow the Old Village to his home, located just beside the road leading to the mountaintop. After a cutscene, you get the famous flute. You must then use it to the big tree under the statue of Buddha at Ayatayu.
