## Welcome to Bob’s Squiggly Sudoku/Du-Sum-Oh Puzzle Page

How To Solve One of These Puzzles
Puzzle Choices
Halloween Squigglies
Squiggly Sudoku puzzles are also known as Latin Squares Puzzles (invented by Mark Thompson), Du-Sum-Oh, Jigsaw Sudoku, Irregular Sudoku, or Geometric Sudoku. Your goal is to fill a square grid with letters so that each row contains every letter exactly once. Each column must also contain every letter once, and so must every region. Several letters are given to start you off.

A sample squiggly is shown below left. The solution is on the right.

The puzzles presented at this website are much stingier with starting hints than those at Sudoku sites. For an NxN puzzle, I usually present only puzzles with N or N-1 hints. Each row, column, or region contains no more than one hint, and no letter appears more than once among the hints. All puzzles here are uniquely solvable. Except as indicated for some of the 9x9s, only simple logic is needed (no guesses or what-if conjectures are required).

In contrast to traditional Sudoku, the geometry of the puzzle gives you additional information that makes up for the shortage of starter hints. See the tutorials for how to make use of this information.

 Puzzles   5x5 Squigglies 5 hints   4 hints Dec/26/2005   6x6 Squigglies 6 hints   5 hints Dec/27/2005   7x7 Squigglies 7 hints   6 hints May/25/2006   8x8 Squigglies 8 hints   7 hints Dec/26/2005                  9x9 Squigglies 9 or 8 hints Nov/11/2005 Holidays   Happy Easter Squigglies Apr/14/2006   Halloween Squigglies Oct/6/2006   Thanksgiving Hidden Squigglies Nov/20/2007   Santa Claus Squigglies Dec/23/2005                  Christmas Hidden 7x7 Squiggly Nov/25/2006   Christmas Hidden Squigglies Dec/15/2007     More Christmas Hidden Squigglies Dec/23/2010 Tutorials 5x5 Squiggly Tutorial Sep/28/2005 7x7 Squiggly Tutorial Sep/28/2005 8x8 Squiggly Tutorial Sep/28/2005 Others   Bumble Beagle Squigglies Dec/23/2005                  Double Du-Sum-Oh Jan/30/2007                  7x7 Rooftop Lights Dec/2001 Older Puzzles Older 6x6 Squigglies Oct/7/2005 Older 7x7 Squigglies Oct/2/2005 Older 8x8 Squigglies Oct/3/2005

Related Stuff
A proof that an N-1 hint Du-Sum-Oh exists for any NxN Mar/26/2006
A brief history of Latin Squares Puzzles

To celebrate the appearance of one of my puzzles in the June/2006 issue of Scientific American, I created a book of 120 new puzzles: Squiggly Sudoku.

The book contains a range of sizes from 5x5 to 9x9. Difficulty levels are from easy (with extra hints, making them easier than puzzles here at the website) to hard (with N-1 hints up through 8x8).
preview