The original “Adventure” game is still popular today because it’s a classic that stands up, even though its interface is ancient by modern standards. What made Adventure special, even without graphics, was the wonderful descriptions. Each room you entered filled your imagination with what it must look like. There was plenty of humor in the descriptions, some really bad puns (paying a troll bridge for example), and even a Monty Python reference. To make the game more challenging there are some red herrings and two mazes you have to figure out how to map and navigate through.
Amateur astronomy is a fascinating field for folks interested in science. Since ancient times astronomers have marveled at the night sky and how it changes over time.