If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Deep into the sea is living a very beautiful creature. Because the prince Poseidon is making a party she needs to look better than the other living creatures. Her advantage is that she is a very beautiful mermaid with a bright tail and her shiny crown will impress the prince. Use your little designer skills and dress up the mermaid.