Sudoku Xtra Specials: Sudoku 25×25 Volume 1
I’ve had many, many, many requests over the past years for a book of giant 25×25 Sudoku puzzles, so I have now finally made just such a book available!
Right at the moment it’s only available in printed form, but I’ll have download copies available in the next couple of days – as soon as I’ve added a purchase mechanism to SudokuXtra.com in fact!
I’ve decided that I’m going to make a series of similar books of particular requested puzzles, all of which will be branded as “Sudoku Xtra Specials”. In this way I can stay organised by keeping all of my download/printed content under the ‘Sudoku Xtra’ heading. It means that you’ll always be able to find all of my new content in one place, without searching around my various sites.
This book is probably the nicest collection of 25×25 puzzles you can find, if you’re a fan of such things. Every puzzle has really nice 8-way symmetry – having noticeable patterns in puzzles like this is pretty unusual, and it can help with the solve too. Just as in my magazines, I’ve thought about what’s sensible in a puzzle like this so they can all be solved without needing pencilmarks. How exactly would you go about making A-Y pencilmarks in each individual square anyway?!
If you get hold of it please do let me know any thoughts you have on it. In the same way as for Sudoku Xtra magazine, it’s designed to be printed at home on either an all-together or a page-by-page basis. And if you get a pre-printed version from Lulu or Amazon.com (already complete but waiting on listing now) then it’s on a large A4 (Lulu) or 8″x10″ (Amazon) page, so there’s plenty of room to write in the solutions.
If there are other books of puzzles you’d like to see, please let me know in the comments here or on the Sudoku Xtra forums – feel free to repeat any requests you’ve made before! Next up is 16×16 Sudoku but after that it’s all open. I was thinking of doing Inequality Sudoku third, but what do you think?
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about 14 years ago
Good on ya for making Xtra speciality puzzle books.
I would really like to see a book devoted to CalcuDoku puzzles. I am starving for decent KenKen type puzzles in Australia. I usually complete the daily one in the Sydney Morning Herald (rated “Challenging”) in about 2 minutes on average.
I would also like to see a book devoted to Skyscrapers. … and Futoshiki while we are asking for things.
about 14 years ago
That’s a good idea [a Calcudoku book] – and evidence suggests that this would be a popular one with other people too, looking at sales figures on Amazon. (I’m talking relative to many other puzzle types)
Skyscrapers is already on the cards – I want to make some puzzles without “every” row/column number written in first, however. And Futoshiki – don’t get much demand for that, but my Mum really likes it so maybe I’ll do it for that reason too!
What size Futoshiki? I personally prefer 5×5 and then 6×6… 
about 14 years ago
Well you shouldn’t disappoint mum!
For sizes I like 5×5 for easy, 6×6 for medium, and 8×8 for hard. I do these to get practice for Inequality Sudoku and Skyscrapers. If the Futoshiki is 9×9 I feel that I might as well do an Inequality Sudoku and get more information.