SudokuSolver Forum

Back in 2006, only a few sudoku variants such as the Killer Sudoku and Skyscraper Sudoku had been invented.

I can consider myself as the pioneer in the invention of sudoku variants outside Japan. After creating sudoku variants for NRICH and other websites for 3 years, it is time now to look back at what I have invented and achieved since 2006.

My first LCM Sudoku variant was invented in April 2008 as shown in http://nrich.maths.org/public/viewer.php?obj_id=6018

A more difficult version of LCM Sudoku was invented in November 2008 as shown in http://www.chinasudoku.com/

A popular sudoku variant invented by me in November 2006 is the Twin Corresponding Sudoku as shown in http://nrich.maths.org/public/viewer.php?obj_id=5477

I also designed it for the Second World Sudoku Championship 2007 at Prague.

One of my friends just pointed out that he found a so-called "Substitution Twin Sudoku" on one website. The puzzle is similar in every way to my "Twin Corresponding Sudoku" except for its name and its position in a vertical direction. This "new" puzzle was published in 2008 while my puzzle was invented and first published in 2006.

I have to thank that person for liking my "Twin Corresponding Sudoku" so much that he changed its name entirely. It won't be surprising that in the future I shall find other "fans" of mine playing similar jokes on me by pubishing my "Twin Corresponding Sudoku" under other names such as "Replacment Twin Sudoku", "Twin Replacement Sudoku", "Similar Twin Sudoku", "Twin Substitution Sudoku", etc.