The hunt is over! Thanks so much for solving! Solutions are available for all puzzles. A wrap-up post will be coming in around a week late January.

Subnivean Snake

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Solves: 467

Errata (2)  —

— A clarification was added to rule 3.

— A missing circle has been added to the penpa grid linked from the Google Sheets template.

Hints

Keywords Hint
solving the logic
The logic is not trivial. The bottom row is a good place to start. Once you've made some preliminary progress, try to match each burrow with its mate using the last rule.
extraction
The word HINT is what gets extracted from the top grid.
example (strong hint)
The H from the word HINT comes from the bolded cell in the third row of the upper grid, which is the eighth cell visited by the snake, in the solution.

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