Update: April 2025

 It's been a busy month, both in terms of work I've had to do and the quantity of puzzle solving. I highly recommend Skeptical Mario's "Sudokuvania: Digits of Despair": it's huge and it's hard, but the difficulty curve builds up the concepts nicely and it's structured so that the player never has to reset too much progress if they make a mistake and always receives feedback if they complete sections correctly.

I've put the writing project on hiatus so that I can focus all my energy into the larger project over the summer. I hope to complete it in May or early June, so that I can publicly release it mid-July. Currently, the project is at least half-complete. The largest bottleneck for the near future is making MS Paint look good, but the final section is what's making it difficult for me to set a precise timeline.

The following puzzle was made on 4/17/25 and was inspired by a conversation about fog and other methods of obscuring information in paper puzzles, as well as Sudokuvania.



  • Normal sudoku rules apply. Digits do not repeat in any row, column, or 2x2 box.
  • Digits along a thermo line strictly increase from the bulb to the rounded tip.
  • The digits on an arrow line sum to the digit placed in the cell with the circle at the beginning of the arrow line.
  • Cells separated by a black dot have a ratio of 2:1. Not all possible black dots are given.
  • Digits cannot repeat within the dashed cage and must sum to the number in the top-left corner of the leftmost cell of the top row of the cage.



This picture is the right way up and was made in https://f-puzzles.com/




Also, these puzzles were made on 4/29/25 while trying to come up with new sudoku variant ideas:
I've been finding it fun to set 4x4 because they're large enough to fit a few interesting deductions into without needing to approach them with standard techniques too often.

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