The first thing you have to do is to get the song Rhythm of the Great Dream, and then go to the next location.
When you play the Rhythm of the Great Dream melody at the door to access Dream Vanarana, a test will start that you'll have to complete in a limited time and in which you'll have to find 15 ghost seeds.
Additionally, you will be able to find dream flowers that you can hit using an electric attack, which will allow you to identify all the seeds. You can also use the Dream Flower barrier to disguise yourself and avoid being attacked, which will save you time.
When you get the seeds, you will have to go back to the Ghostly Gate, to get the reward chest. Thus we come to the end of this article on how to solve the Apam Woods Ghostly Door puzzle in Genshin Impact, so we hope we have been helpful, and we hope you manage to complete this puzzle very quickly.