A thank you letter- but is that all it is?

This is a compact puzzle with a few layers to solve. It appears to be a thank you letter. A very strange thank you letter from The Decoder Ring Organization. And, there’s something else in the envelope to help you.

Also available as an add-on to other tiers.

← See the main post for more info on adding this on if you’ve already pledged $5 or more.

(This piece of mail does not affect the story that is laid out in the standard Seasons, but it is a fun little enhancement that will arrive before the rest of the story in December.)

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