Sudoku by Thomas Snyder
or solve online (using our beta test of Penpa-Edit tools)
Theme: Four Loops (Originally for the 2017 Arlington Puzzle Festival)
Author/Opus: This is the 284th puzzle from Thomas Snyder, aka Dr. Sudoku.
Rules: Standard Sudoku rules.
No answer string (just click “solve”).
Time Standards (highlight to view): Grandmaster = 1:45, Master = 3:00, Expert = 6:00
Solution: PDF
Note: Follow this link for other classic Sudoku. If you are new to this puzzle type, here are our easiest Sudoku to get started on. More classic Sudoku puzzles can be found in The Art of Sudoku, The Art of Sudoku 2 and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.