Last week's puzzle Toroidal Sudoku (Daily Sudoku League #110) was tough. However it was made after twisting a Irregular/Jigsaw Sudoku. It was pointed out by Bram that a Toroidal Sudoku is the one which can not reconstructed to a Jigsaw Sudoku. I have taken his feedback and will try to create Toroidal Sudoku which is not dependent on Jigsaw Sudoku.

Now coming to today's Sudoku, I am not very good in solving Classic Sudoku. So many of the times I try to create a Sudoku Variations and send it for testing to Prasanna. Many of the puzzles which I create Prasanna is able to solve it using the Classic Sudoku rules only. This happen twice recently with my two Sudoku variations, Disjoint Groups Sudoku and Symmetric Unequal Sudoku. However today's No Four in a Grow Sudoku is the puzzle in which one need to use the variation rules again and again to solve it. I will rate this puzzle as tough. It will be interesting to see how much time best Sudoku players in the world take to solve this puzzle. Hopefully they will not be able to solve it using only the Classic Sudoku rules :).

This No Four in a Grow Sudoku is my 111th contribution for The League of Extraordinary Ladies and Gentlemen.

**Rules of No Four in a Grow Sudoku**
Standard Sudoku rules apply. Additionally, nowhere in the grid the vertical or horizontal line of four constantly decreasing/increasing numbers can appear (example: 1359, 8642 etc.).

No Four in a Grow Sudoku (Daily Sudoku League #111) |

Solution of Fun With Sudoku Series Puzzle Non Consecutive Sudoku (Fun With Sudoku #60)

Non Consecutive Sudoku (Fun With Sudoku #60) Solution |

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