Monday, 25 May 2026

Puzzle No. 500: Arrow-Sum Sandwich-Kropki Pairs Sudoku

Hi all. It really feels great to reach 500 Sudokus on my blog. When I started the blog, I never imagined I would come this far. To celebrate this milestone, I am offering a discount of 20% on pdf copies of all books available on payhip. Here is the link https://payhip.com/worldofsudoku

Rules: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box.

There are some arrow shapes in the grid. The sum of the digits along the path of each arrow must equal the digit in the circled cell. Digits may repeat along an arrow.

Clues outside the grid represent the sums of the digits sandwiched between the 1 and the 9 in that row or column.

A black dot between two digits means one of them is double the other. Not all possible black dots are necessarily given.

Online Solving Link to Penpa

Online solving Link to Sudokupad

Tuesday, 19 May 2026

Puzzle No. 499: Thermo Sudoku

Rules: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box.

There are some thermometer shapes in the grid. The digits are strictly in increasing order from the bulb to the flat end of each thermometer.

Online Solving Link to Penpa

Online Solving Link to Sudokupad

Friday, 8 May 2026

Puzzle No. 498: Extra Regions Sudoku

Rules: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box.

Each group of nine shaded cells must also contain the digits 1 to 9.

Online Solving Link to Penpa

Online Solving link to Sudokupad

Thursday, 30 April 2026

Puzzle No. 497: Odd Even Sudoku

Rules: Classic Sudoku rules apply. Cells containing grey circles contain only odd digits. Cells containing grey squares contain only even digits.

Online Solving Link to Penpa

Online Solving Link to Sudokupad

Tuesday, 28 April 2026

WORLD OF SUDOKU PRESENTS CHALLENGING SUDOKU: VOL # 1

Hello all. My new book WORLD OF SUDOKU PRESENTS CHALLENGING SUDOKU: VOL # 1 is now available on Amazon in paperback format and on Payhip in PDF format.

This book contains 150 handcrafted classic sudokus. The sudokus are hard and challenging, yet they can all be solved without the use of any advanced strategies or guess work. All you need is the knowledge of basic sudoku techniques and a bit of perseverance when you are stuck in a puzzle and you should be able to crack the puzzle.

All the sudokus are provided with online solving links to Penpa as well as Sudokupad so that the solvers can also solve the puzzles on their gadgets.

All the sudokus are test solved by Édouard Lebeau and his solving times are mentioned with each puzzle.

I hope the book will be fun to solve. It also serves as an ideal practice material for sudoku championships as the difficulty level is similar to the ones that appear in various sudoku championships.

Link to Amazon https://www.amazon.com/dp/B0GYRD8DLW

Link to Payhip https://payhip.com/b/n1JIf