Can you unsolve a Fog Sudoku?

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Published on April 12, 2025 1:30:04 PM ● Video Link: https://www.youtube.com/watch?v=7EiMREgoL0g

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BremSter solves "Sunny, with a chance of fog" by pdyxs.
This Encroaching Fog Sudoku uses the Renban and Kropki Pairs constraints displayed in an unusual way.
🧩 Solve in Sven's SudokuPad WebApp: hhttps://sudokupad.app/pdyxs/sunny-with-a-chance-of-fog
🛑 WARNING: Normal colouring and the Pen Tool do not work properly in this grid!


This puzzle has been published on Logic Masters Germany: hthttps://logic-masters.de/Raetselportal/Raetsel/zeigen.php?id=000MJC

📋 Puzzle Rules:
To start, you need to know these rules:
• Sudoku: Fill the grid with the digits 1-9, so that each digit occurs exactly once in every row, every column and every 3x3 box.
• Renban Lines: Digits on a line form a set of non-repeating, consecutive digits in any order.
Later, you'll need to know these as well:
• Encroaching fog: The grid is not covered in fog. Placing a correct digit in a cell will summon fog to that cell, and to the 8 surrounding cells. No guessing or erasing of digits is required.
• Kropki: If two cells do not have a grid line between them, their digits are consecutive. If a renban line is hollow between two cells, the digit in one cell is double the other. Not all kropki clues are given.
Notes:
• In this puzzle, constraints are being rendered in non-standard ways.
• The colour tool will not work, and the line tool is strange. Such is the price of summoning fog!


0:00 Intro
2:15 Rules
5:52 Puzzle Solve

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#sudoku #sudokusolver
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