Solution to Sudoku no 534

Sudoku no 534 (Extreme)

Play online

Sudoku grader and solver 

See answer 

Solution to Sudoku no 533

Sudoku no 533 (Easy)

Play online

Sudoku grader and solver 

See answer 

Solution to Sudoku no 532

Sudoku no 532 (Tough)

Play online

Sudoku grader and solver 

See answer 

Solution to Hidoku no 4

Here is the solution created by my program:
  
andrew@LUBUNTU-Laptop:~/Hidoku$ cat answer
022 021 020 019 018
023 025 016 017 007
024 015 009 008 006
014 010 001 005 003
013 012 011 002 004
andrew@LUBUNTU-Laptop:~/Hidoku$

...and here is the solution created by the online solver I used:

Hidoku no 4 (5 by 5)

In previous hidoku puzzles I have created the grids in a Google Docs document. Then I have used the snipping tool from my browser to cut out the puzzle and answer as images. This produces quite a pleasing effect but it runs the risk that I could copy the puzzle incorrectly and publish one with zero or multiple solutions. I need to avoid that so for this puzzle I am trying a different approach. Here is the puzzle as I created it on my Lubuntu laptop:

andrew@LUBUNTU-Laptop:~/Hidoku$ cat nxnpuzzle.txt
__,__,__,19,__
__,25,__,__,__
__,15,__,__,__
__,__,01,__,03
__,__,__,__,__
andrew@LUBUNTU-Laptop:~/Hidoku$

I keyed it into a hidoku solver I found here and produced the image below. Then I pressed the Solve button and checked that the answer matched the one I had on my laptop. This confirmed that I had entered the puzzle correctly.

Here is a reminder of the rules. I arranged the numbers 1 through 25 in ascending order on the grid below before removing some of them at random. Your job is to replace the numbers I have removed. When you have finished, the grid must contain all the numbers 1 through 25 exactly once and cells with consecutive numbers must be joined horizontally, vertically or diagonally:

See answer

Solution to Sudoku no 531

Sudoku no 531 (Diabolical)

Play online

Sudoku grader and solver 

See answer 

Solution to Sudoku no 530

Sudoku no 530 (Extreme)

Play online

Sudoku grader and solver 

See answer 

Solution to Sudoku no 529

Sudoku no 529 (Easy)

Play online

Sudoku grader and solver 

See answer 

Solution to Hidoku no 3

Hidoku no 3 (4 by 4)

Now I need to try out various puzzle sizes to see if my program can create them successfully. This is a 4 by 4 puzzle, which is also quite easy.

Here is a reminder of the rules. I arranged the numbers 1 through 16 in ascending order on the grid below before removing some of them at random. Your job is to replace the numbers I have removed. When you have finished, the grid must contain all the numbers 1 through 16 exactly once and cells with consecutive numbers must be joined horizontally, vertically or diagonally:

See answer

Solution to Killer Sudoku no 8

Killer Sudoku no 8

Usual sudoku rules apply i.e. each row, column and 3x3 mini-grid must have all of the numbers 1 to 9 exactly once. The puzzle is also divided into smaller areas called cages, which are surrounded by dashed lines. Numbers are not repeated within a cage. The number in the top left hand corner of each cage shows the sum of the numbers in that cage:

Solve online

See answer 

Solution to Sudoku no 528

Sudoku no 528 (Tough)

Play online

Sudoku grader and solver

See answer 

Solution to Sudoku no 527

Sudoku no 527 (Diabolical)

Play online

Sudoku grader and solver 

See answer 

Solution to Word Search no 2 (Car Manufacturers)

Word Search no 2 (Car Manufacturers)

I created this puzzle here.

Working horizontally, vertically or diagonally, find the following car manufacturers in the grid below:

AUDI, AUSTIN, BMW, CHRYSLER, CITROEN, DATSUN, FERRARI, FIAT, FORD, HONDA, HYUNDAI, JAGUAR, MORRIS, RENAULT, RILEY, SAAB, SIMCA, SUBARU, TOYOTA, VOLVO.

See answer

Solution to Sudoku no 526

Sudoku no 526 (Extreme)

Play online

Sudoku grader and solver

See answer

Solution to Sudoku no 525

Here is my original version of the solution:

...and here is another from Shashank Ishwar, a member of the Sudoku Puzzles Facebook group. He has used the link I provided to work out the puzzle interactively:

Sudoku no 525 (Moderate)

Play online

Sudoku grader and solver

See answer