Adventures of Mana - "Remember the 8" puzzle to get into Medusa's cave

Here's how to get into the Medusa's cave (Shifting Sands Dungeon) in the desert. Walk in the form of an 8 around the two palm trees in the oasis. Gameplay impressions:
This is a remake of Final Fantasy Adventure / Mystic Quest (Sword of Mana) and the first part of the Mana series. This game is made by SQUARE-ENIX
Available on iTunes:
Google Play:
"Folge der 8 bei den Palmen" Rätsel in der Wüste. Eine "Acht" um die Palmen laufen.