You were walking down the street, when suddenly you see a light from further away. As you were approaching it, you can feel it's aura. It was some sort of a portal, 7 meters tall, and it was levitating in the air. Suddenly it spoke:

Greetings. This is a chance of an amazing adventure. If you wanted to be in another world, what world would that be?" This portal gives you the chance to visit it, have fun :)