RULES : Classic sudoku rules apply. Shaded 3x3 squares are magic squares. The sum of the numbers in all rows, columns and two diagonals should be equal in a magic square.
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A very happy new year to all of you. Welcoming the new year with a thermo sudoku. I had created this sudoku before the 2019 themed thermo s... -
RULES : Classic sudoku rules apply. Adjacent digits along each marked line have a difference of at least 5. -
RULES: Classic Sudoku rules apply. Additionally, digits along the given lines read the same from either direction on the line. -
RULES : Classic Sudoku rules apply. Additionally, each group of nine shaded cells must also contain the digits 1 to 9. Online Solving -
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 box. Solve Online -
Triple Sum Sudoku for GP practice RULES : Each row is divided into 3 parts. The 1st part is a 4-digit number, the 2nd part (sh... -
RULES : Classic sudoku rules apply. If a grey circle is given between two adjacent cells, then the numbers in those cells will be consecu... -
It is an amazing feeling to reach 200 sudokus on my blog today. I had started this blog in the year 2017. The year 2020 started with Sudoku... -
This classic sudoku is taken from my new book WORLD OF SUDOKU : VOL # 4. The book contains 120 handcrafted classic sudokus ranging from mo... -
RULES : Classic sudoku rules apply. Additionally, orthogonally adjacent cells cannot contain consecutive digits. Also, a digit cannot repe...
Puzzle No. 458: Sum Next to 9-Renban 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. Clue...
6:10, it seems that the classic part was harder as compared to the variant part
ReplyDelete17:08. Was solving this variant for the first time. Was completely clueless for the first 5 minutes!
ReplyDeleteIf you know the properties of a magic square , it won't take you so long.
Delete7:24.Just when I thought that this was again going to be case of a difficult classic part, noticed a pair and also used uniqueness to solve the sudoku. Beautiful construction.
ReplyDeleteThanks kishore. A bit slow . I expected around 5 minutes from you.
DeleteFor me magic part was more difficult compared to classic part. Hard one.
ReplyDeleteBasically, if you are aware of the positions of the digits in a magic square , you will not find it very difficult..
DeleteYou can do the magic square part first, without working anywhere else on the puzzle.
ReplyDeleteMagic squares really are that restrictive. Applying both the magic squares and the sudoku restrictions, and switching when you get stuck will solve both squares.
Non spoiler hint for those struggling with the squares.
The numbers from 1-9 (which are all present in the square) sum to 45. Given this fact, which is easily verified, there is only one possible sum to share between all 3 rows, or all 3 columns. Figuring out this sum (or just googling 3x3 magic square) allows you to deduce enough further restrictions to solve the magic squares with the givens.