If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Princess Oceana is part of a royal family that goes back over 1000 years. One day, She found an old chest in the attic of her castle. Inside was one of the most amazing things she had ever seen. A shell necklace that has the ability to turn its wearer into a mermaid. Dress Oceana as a princess then click her shell to dress her as a mermaid.