This EP adds a lot of new gaming choices, including the ability to make your Sim supernatural in Create a Sim or during gameplay. When paired with Island Paradise EP, you can also create a mermaid but that must be done in game. If you want to play a normal game and have this EP, be sure to turn off supernatural creatures in world settings. Sometimes zombies try to attack your Sims. It is very annoying and also kind of glitchy.