(2) Sea Level
The Maze Runner isn't particularly challenging insofar as the language is simple, the chapters are short, and the messages that the author wants you to receive are practically spelled out. It's perfect for a rainy-Saturday-afternoon-snuggled-up-on-the-couch-with-blankets-and-hot-chocolate kind of mindless pleasure. The real challenge will be putting the book down at the end of a chapter.