Try the new AI-powered Infinite Story.

Hall of Infinite Doors

...The darkness of your mind that is. You are completely insane now and having confronted many strange obstacles. You have resisted the oppurtunity to escape and have just passed 99 blank doors. It all seems the same now...

How insane are you? Well, the next few doors contain the names of other planets that exist in the universe. None of these planets have come into contact with one another yet and all believe that they are alone in the universe, just like Earth.

Want to travel to another planet?