Episode 4 begins with us landing on Earth's moon - this place clearly hasn't seen life in years, but there's bound to be some interesting things in the bowels of the theme park.
Unlike normal walkthroughs, in Nice Game Hints you can select just the puzzle you want hints for. Here are listed the puzzles for "Episode 4 - Hidden Secrets of the Moon" in Dexter Stardust: Adventures in Outer Space. The guide you choose only contains information about that puzzle, reducing possible spoilers for other puzzles.