You have to dive deep in this mission and pick up the magical shell and magical heart. But do not forget to pick up the diamond to replace your air and complete your task! Help Winx Mermaid Layla to collect all.
Use the arrows keys (right , left) and the spacebar to swim.
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.