Mila the brave mermaid AVI M4

Mermaid Mila always has fun adventures. Mila the mermaid finds a chest. 'Would it be a treasure?' she wonders. "Open it quickly!" calls Fin the seahorse. But alas, the chest is locked. Fin swims to a small crack. And then... he's in! At that moment the box starts to slide. It goes up slowly. Who does that? Not Briesbaard the pirate? How can Mila save her boyfriend? Suitable from 7 years.