quadratablog

[quadratablog]

In this new Sudoku puzzle, the clues reveal when one number is either 2,3,4 or 5 times another. Further instructions are on the puzzle. The solution, more info, and a PDF version can be found at http://quadratablog.blogspot.com/2023/09/small-multiples-sudoku.html

#puzzle #math #puzzles #maths #sudoku

[quadratablog]

I feel spring is a good time for honeycomb puzzles.  Instructions are on the picture and both the solution and a PDF version are available at my website: http://quadratablog.blogspot.com

#puzzle #math #maths

[quadratablog]

Here is one last 2023 Sudoku before we get too far into the year.  All the clues are based on the numbers 2, 3, and 23.  A solution and PDF version are at https://quadratablog.blogspot.com/2023/02/2023-reprise.html.

#sudoku

[quadratablog]

Here's a Sudoku I made for 2023 with clues using only the numbers 2,3, and 23.  The solution, a PDF version, and an easier version of the puzzle with more clues can all be found at: https://quadratablog.blogspot.com/2022/11/2023-new-years-puzzle.html

#math #sudoku #puzzle #maths #puzzles

[quadratablog]

Here's a fairly easy puzzle that I whipped up this morning, with clues based on the size of the products of the numbers in adjacent cells. The solution and a higher quality PDF version can be found at https://quadratablog.blogspot.com/.

#math #maths #puzzle #puzzles #brainteaser

[quadratablog]

I recently posted a set-union puzzle so here's a new puzzle that uses set-intersections for clues.  Info on set-intersections, the solution, a PDF version, and more information can be found at: https://quadratablog.blogspot.com/2022/10/intersections.html #mtbos #math #maths #puzzles #puzzle

[quadratablog]

Here is a sudoku puzzle I made to commemorate my ten-year puzzle-creating anniversary.  More info, a PDF version, and the solution can be found at: https://quadratablog.blogspot.com/2022/08/10th-anniversary-of-puzzle-creation.html

#sudoku #math #puzzle

[quadratablog]

My new puzzle today is based on sets and their unions. The small amount of set theory needed to try it can be found on my blog, along with the solution and PDF at this link: https://quadratablog.blogspot.com/2022/07/unions.html

#math #maths #puzzle

[quadratablog]

I was delighted to see that this month's Wolfram Blog entry by Matthew Sottile featured one of my chess puzzles from Math Horizons.  You can find the article here:

https://blog.wolfram.com/.../solving-knightdoku.../

I figured readers might want to try some Knightdoku of their own, so I'm posting some new ones over at my blog.  These are all meant to be solved for fun by humans without the aid of computers.  One of them is posted above here.  The other two can be found at my blog here: 

 https://quadratablog.blogspot.com/2022/04/wolfram-blog-and-quadratablog.html

#math #sudoku #chess #puzzle

[quadratablog]

Enter 1 through 8 into the large circular cells so that each appears twice and adjacent cells contain different numbers. The clues between cells reveal the sum of those two cells. Numberless clues indicate that the sum is larger than eight without revealing that sum. Solution and more at: https://quadratablog.blogspot.com/2021/07/petersen-eight-graph-sum-puzzle.html

#puzzle #math #maths #brainteaser

[quadratablog]

This is a slightly larger variation of my last puzzle entry.  Each row and each column contains 1 through 6 exactly once, but NO cage is allowed to contain all distinct numbers!  Clues when given must equal the sum of the entries in that cage.  

Solution and more info at: https://quadratablog.blogspot.com/2021/06/non-distinct-partition-puzzle.html

#math #maths #puzzle #puzzles #brainteasers

[quadratablog]

Here's another calcudoku/KenKen style of puzzle but with a different twist.  What if the entries in each cage are -forbidden- from being distinct?  For example, a cage with three entries which add to 9 could be 4,4,1 but couldn't be 2,3,4, since those numbers are all different.  Here are some small quick puzzles just to demonstrate the idea.  All of the clues reveal the sums of the entries in that cage, but regardless of whether or not there is a clue, the entries in each cage cannot be distinct! 

 For the solution, a PDF, and more information, visit: https://quadratablog.blogspot.com/2021/05/mini-non-distinct-partition-puzzles.html

#mtbos #puzzle #puzzles #math #maths

[quadratablog]

Here are some small easy puzzles.  Each row and column contains all the numbers 1 through 4, no cage contains duplicate numbers, and the numbers in a cage sum to a clue whenever a clue is given. 

 Solution, PDF, and more at:

https://quadratablog.blogspot.com/2021/05/mini-distinct-partition-puzzles.html 

#math #maths #puzzle #mtbos

[quadratablog]

New concept: Place 1 through 6 in the cells so each appears once in every row and column.  The entries in each cage must be DISTINCT and sum to the clues when one is given. For more info visit: https://quadratablog.blogspot.com/2021/04/distinct-partition-puzzle.html

#puzzle #math #maths #brainteaser #mtbos

[quadratablog]

Here's a new style of puzzle I made for Spring!  Arrows point from larger numbers to smaller numbers.  A dashed line means the numbers are not far apart (the difference is 1 or 2) and a solid line means the numbers are farther apart (the difference is 3 or 4.)  Use each of the numbers 1 through 5 exactly three times. For more info and the solution visit: https://quadratablog.blogspot.com/2021/03/honeycomb-sizedoku.html

#puzzle #math #maths #brainteaser

[quadratablog]

The clues in this new style of puzzle depend on the number of primes in the two cells.  A numeric clue indicates exactly one is prime and reveals the difference of the two numbers.  A numberless clue indicates that either both or neither of those two entries are prime numbers.  (Remember that 1 is not a prime!)

#puzzle #math #maths

[quadratablog]

Here's a 'word' puzzle I made where the clues represent the distance between letters in the alphabet. Clues are given whenever the letters are close to each other, specifically distance 3 or less. More info and solution at: https://quadratablog.blogspot.com/2020/04/small-distance-word-cages-quadrata.html

#puzzle #puzzles #sudoku