PUZZLE NO. 302 : THERMO SUDOKU

IT'S ISC 2021

This puzzle was created by me for ISC 2021. But the testers found it a bit hard for a contest. So I am posting it on my blog.

RULES : Classic Sudoku rules apply. Additionally, there are some thermometer shapes in the grid. The numbers are in increasing order from the bulb to the flat end on each thermometer.

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WORLD OF SUDOKU : VOL # 5

                                           

 

Hi all !

           My 5th book in the series World Of Sudoku is now available in all the international markets of amazon as paperback. It is also available in digital format on payhip. The book contains 120 handcrafted sudokus covering 10 different mathematical variants. There are two variants each using addition, subtraction, multiplication & division operators and two variants that use a mix of mathematical operators. Each variant is explained in details with the help of illustrations. All sudokus are test solved by Swaroop Guggilam and his timings for each sudoku are mentioned. Also, online solving link for each sudoku is also provided. The sudoku on the cover page is a hybrid of all ten variants and is also solvable.

            I am sure that this book will be liked and appreciated by sudoku solvers. 

            The links to the book are given below :

  Link to amazon : https://amzn.to/3wHfAWl

  Link to payhip : https://payhip.com/b/PZXnl

           Happy solving !

PUZZLE NO. 301 : THERMO-ARROW HYBRID SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, there are some thermometer shapes in the grid. The numbers are in increasing order from the bulb to the flat end on each thermometer. Additionally, 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. 

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PUZZLE NO. 300 : HYBRID SUDOKU

 

RULES : Classic Sudoku rule applies. There are three grey lines in the grid. One line follows Renban Sudoku rules; one line follows Palindrome Sudoku rules; one line follows German Whispers Sudoku rules. It is for the solver to determine the characteristics of each line. The white and black dots are kropki dots. Converse rule does not apply.

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PUZZLE NO. 299 : KILLER SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally , there are some cages in the grid. The number on the top left corner of each cage is equal to the sum of the digits in that cage. Digits do not repeat inside a cage.

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PUZZLE NO. 298 : FORTRESS SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, there are some grey cells in the grid. Digits in the grey cells are larger than all orthogonally ( horizontally & vertically ) adjacent white cells.

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PUZZLE NO. 297 : ROLL SUDOKU

 

RULES : Apply Classic Sudoku rules to each of the 9x9 grid. Note that multiple grids are overlapping.

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PUZZLE NO. 296 : ODD EVEN SUDOKU

 

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

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PUZZLE NO. 295 : ARROW SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, 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.

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PUZZLE NO. 294 : WINDOKU

 

RULES : Classic Sudoku rules apply. Each of the four shaded 3x3 regions must also contain digits from 1 to 9.

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PUZZLE NO. 293 : PENCIL MARKS SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, some cells have digits on the top left side. One of those digits can only be placed in the respective cells.

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PUZZLE NO. 292 : DIAGONAL SUDOKU

 

Classic Sudoku rules apply. Additionally, each main diagonal ( marked by dotted lines ) must contain digits from 1 to 9.

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PUZZLE NO. 291 : KILLER SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally , there are some cages in the grid. The number on the top left corner of each cage is equal to the sum of the digits in that cage. Digits do not repeat inside a cage.

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WORLD OF SUDOKU : VOL # 4 NOW AVAILABLE IN INDIA ON AMAZON.IN

 

Hello everyone. My book World Of Sudoku : Vol # 4 is now available in India on amazon.in. This book contains 120 handcrafted classic sudokus ranging from moderate to tough. All the sudokus are high on aesthetics with nice logical solve paths. The book also covers various advanced strategies like x-wing, swordfish, xy-wing, unique rectangles and other techniques that are required to crack the toughest of sudokus. All the sudokus are test solved for uniqueness by Netherland's top sudoku solver Chiel Beenhakker ( popularly known as Bakpao ) and his timings for each sudoku is mentioned so that the solver can compare his/her timings with that of Chiel's. Another exciting feature of the book is the online solving links with automatic answer checking enabled for each sudoku for people who like to solve sudokus online. This book is a must have in the collection of Sudoku books for the Sudoku enthusiasts. The link to the book is https://amzn.to/3kn7egT

PUZZLE NO. 290 : IRREGULAR 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 outlined region. Each outlined region is marked by thick borders.

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PUZZLE NO. 289 : X SUMS SUDOKU

 

RULES : Classic sudoku rules apply. Additionally , the clues outside the grid indicate the sum of the first X digits placed in the corresponding direction , where X is equal to the first digit placed in that direction.

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PUZZLE NO. 288 : AVERAGE SUDOKU

 

RULES : Classic Sudoku rules apply. A digit in a circle is the average of the digits in all cells connected to it with a line.

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PUZZLE NO. 287 : CLASSIC 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 box.

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PUZZLE NO. 286 : CLASSIC 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 box.

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PUZZLE NO. 285 : CLASSIC 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 box.

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PUZZLE NO. 284 : CLASSIC 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 box.

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PUZZLE NO. 283 : CONSECUTIVE PAIRS SUDOKU

 

RULES : Classic Sudoku rules apply. If a grey circle is given between two adjacent cells, then the digits in those cells will be consecutive. Not all grey circles are given, which means adjacent cells without a grey circle may or may not contain consecutive digits.

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PUZZLE NO. 282 : KILLER SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally , there are some cages in the grid. The number on the top left corner of each cage is equal to the sum of the digits in that cage. Digits do not repeat inside a cage.

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PUZZLE NO. 281 : KILLER SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally , there are some cages in the grid. The number on the top left corner of each cage is equal to the sum of the digits in that cage. Digits do not repeat inside a cage.

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PUZZLE NO. 280 : GERMAN WHISPERS SUDOKU

 

Special thanks to Nityant Agarwal for test solving this and also for a couple of suggestions that made this sudoku better than it originally was.

RULES : Classic Sudoku rules apply. Adjacent digits along each marked line have a difference of at least 5.

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PUZZLE NO. 279 : CLASSIC 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 box.

Online Solving

PUZZLE NO. 278 : ODD EVEN SUDOKU

 

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

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PUZZLE NO. 277 : ARROW SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, 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.

Online Solving

PUZZLE NO. 276 : KILLER SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally , there are some cages in the grid. The number on the top left corner of each cage is equal to the sum of the digits in that cage. Digits do not repeat inside a cage.

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PUZZLE NO. 275 : SUM FRAME SUDOKU

 

RULES : Classic Sudoku rules apply. Clues outside the grid represent the sum of the first three digits in the corresponding row or column.

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PUZZLE NO. 274 : THERMO SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, there are some thermometer shapes in the grid. The numbers are in increasing order from the bulb to the flat end on each thermometer.

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PUZZLE NO. 273 : KILLER - LITTLE KILLER HYBRID SUDOKU

 HAPPY BIRTHDAY

The best way to always remember your wife's birthday is to forget it once. I bet, you will remember it all your life. Happy Birthday to my better half . 

RULES : Classic Sudoku rules apply. Additionally , there are some cages in the grid. The number on the top left corner of each cage is equal to the sum of the digits in that cage. Digits do not repeat inside a cage. Also, numbers with arrows outside the grid indicate the sum of the digits in the corresponding direction. Digits may repeat in the corresponding direction.

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PUZZLE NO. 272 : KROPKI PAIRS SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, if the absolute difference between two digits in neighboring cells equals 1, then they are separated by a white dot. If the digit in a cell is half or double of the digit in a neighboring cell, then they are separated by a black dot. The dot staying between 1 and 2 can have any of these dots. All possible dots are not marked.

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PUZZLE NO.271 : IRREGULAR 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 outlined region. Each outlined region is marked by thick borders.

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PUZZLE NO. 270 : LIAR XV SUDOKU

 

RULES : Classic Sudoku rules apply. The given Xs and Vs are all liars. Horizontally or vertically adjacent cells separated by an X  add up to either one more or one less than 10, i.e. 11 or 9. Horizontally or vertically adjacent cells separated by a V add up to either one more or one less than 5, i.e. 6 or 4. Converse rule applies , i.e. all possible Xs and Vs are marked.

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PUZZLE NO. 269 : XV SUDOKU

 

RULES : Classic Sudoku rules apply. If the sum of digits in orthogonally adjacent cells is 10, then they are separated by an X. If the sum of digits in orthogonally adjacent cells is 5, then they are separated by a V. All possible Xs & Vs are marked.

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PUZZLE NO. 268 : LIAR ARROW SUDOKU

 

RULES : Classic Sudoku rules apply. The arrow shapes in the grid are all lying. The digit in the circled cell of each arrow must be either one more or one less than the sum of the digits along its path. Digits may repeat along an arrow.

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PUZZLE NO. 267 : TRIO SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, cells containing grey circles will only contain digits 1, 2 & 3. Cells containing grey squares will only contain digits 4, 5 & 6. Cells containing grey diamonds will only contain digits 7, 8 & 9.

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PUZZLE NO. 266 : SUM FRAME SUDOKU

 

RULES : Classic Sudoku rules apply. Clues outside the grid represent the sum of the first three digits in the corresponding row or column.

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PUZZLE NO. 265 : ARROW SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, 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.

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PUZZLE NO. 264 : FORTRESS SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, there are some grey cells in the grid. Digits in the grey cells are larger than all orthogonally ( horizontally & vertically ) adjacent white cells.

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PUZZLE NO. 263 : ODD-EVEN PAIRS SUDOKU

 

RULES : Classic Sudoku rules apply. Exactly one odd and one even digit must be placed in each marked pairs of adjacent cells.

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PUZZLE NO. 262 : TRUE OR LIE SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, given clues (small numbers at top left corner of cells) may be correct or wrong. If the clue is wrong, then the correct digit is either 1 higher or 1 lower.

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PUZZLE NO. 261 : CLASSIC 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 box.

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PUZZLE NO. 260 : KROPKI SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, if the absolute difference between two digits in neighboring cells equals 1, then they are separated by a white dot. If the digit in a cell is half or double of the digit in a neighboring cell, then they are separated by a black dot. The dot staying between 1 and 2 can have any of these dots. All possible dots are marked.

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PUZZLE NO. 259 : ODD SUDOKU

 

RULES :  Classic Sudoku rules apply. Additionally, cells having grey circles will contain only odd digits.

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PUZZLE NO. 258 : LIAR SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, every given clue is lying. The correct value is either one more or one less than the given clue. 

Note : A 1 can only have value 2 and a 9 can only have value 8.

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PUZZLE NO. 257 : PENCIL MARKS SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, some cells have digits on the top left side. One of those digits can only be placed in the respective cells.

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PUZZLE NO. 256 : ARROW SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, 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.

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PUZZLE NO. 255 : THERMO SUDOKU

 

RULES : Classic Sudoku rules apply. Additionally, there are some thermometer shapes in the grid. The numbers are in increasing order from the bulb to the flat end on each thermometer.

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