First Impressions:
Love the premise for how the game is played. Love the execution of the components of play and how it's taught and presented. Excellent eye for aesthetics.
Questions:
Having not yet gotten to play it, I'm trying to sort out how it would play if you sent the map back and forth between you and one other person? Given the same address/Zipcode, would that induce a sort of pattern in moving forward?
What if you further randomized the #'s for the Cartogropher Key - again, I might be missing something here - What if you had a randomly generated set of digits that were written on the outside of the letter, instead of using elements of the address?
Favorite Bits:
The absolutely dynamite way this game is put together for presentation, taking note of the orientation and how the letter folds, elements like that make this game really great to print and hold.
The premise of the activity itself is awesome, but it feels like using just one map is the better way to go, which is why I didn't rate it higher for stars in regards to this jam. I think mailing a singular map around is the best way to achieve the goal (a detailed sandbox setting for a fantasy game), so it's only a criticism in the sense that the jam was asking for 2 or more maps doing different things. But this is an excellent idea that I would love to see polished and put out there!