Before starting your escape, either watch the video or read the instructions.
Reaching your home after a long day, you find an envelope entitled "Once in a Blue Moon" on your doorstep. Intrigued, you open it to find a mysterious letter:
Dear Adventurer,
A moon is said to be 'blue' when it is the second full moon in the same month. This astronomical phenomenon occurs on average only once every 2.4 years. What are the chances that a blue moon is visible on the same night as Halloween? This coincidence occurred in 1955, in 2020, and will reoccur in 2039! Please regard this letter as your official invitation. One that is as rare as the blue moon that will be shining down on us very soon.…
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