Encaged Four Sudoku by Bill Murphy
(This post is part of the Genuinely Approachable Sudoku (GAS) series.)
Bill has also been exploring “Encaged” puzzles, and we think you’ll enjoy finding out how to keep the missing fours under control in this Sudoku.
or solve online (using SudokuPad)
Author/Opus: This is the 117th puzzle from Bill Murphy, part of the Genuinely Approachable Sudoku (GAS) team.
Rules: Insert a number from 1 to 9 into each cell so that no number repeats in any row, column, or bold region. Also, all fours are encaged by odd numbers; this means that around the fours all orthogonally adjacent cells must be odd.
GAS Time Standards (highlight to view): Two party hats (🎩🥳): 7:30; One party hat (🥳): 14:00. All other solvers earn a 🦕: Fourtress Fabrosaurus.
Thomas Hits the GAS (highlight to view): 2:03, with SudokuPad replay file shared as a download for now (requires loading via settings menu with improvements expected before people should use this regularly).
Solution: PDF; solving video with explanation to be added later from GAS team.
Note: Follow this link for other less common variations of Sudoku.
Note 2: Comments on the blog are great! For a more interactive discussion, please also consider using our Daily GAS discussion post on the GMPuzzles Discord. Not a member of the Discord? Click this link for basic access.