Teen Ink

Summary: All of a sudden, fifty people from all over the world are randomly taken to a weird world called The Oblivion. They must live there and take challenging tests, only remembering their first name. If they fail, they must stay in The Oblivion until all of humanity is dead, remembering every part of the life they had lived before going there. Oh, and The Oblivion is run by a teenage wizard who created the weird world, and he isn't always fair...