**about 9 years ago** - Comments Off

Wow, it is a long time since I posted here. So much to do, so little time!

I might as well keep it brief now, then. Here’s a puzzle for April 1st (it’s actually a normal puzzle without tricks – it just spells ‘FOOL’ in the given numbers). Place 1 to 9 in each row, column More >

**about 10 years ago** - Comments Off

Sudoku Box-Jigsaw 9×9 1 puzzleI haven’t posted a puzzle for a good while, so I thought it was time to fix that with this Box-Jigsaw Sudoku puzzle.

The puzzle combines regular Sudoku with Jigsaw Sudoku. Just place 1 to 9 once each into all of the nine rows, columns, 3×3 boxes (indicated by both shaded and More >

**about 10 years ago** - Comments Off

A brand new book, packed with 101 Jumbo 3D Sudoku, is now available for purchase from Amazon. You can either search for this directly, or you can click through via my PuzzleBooks.org site – the book is at the very bottom of that page, and clicking on it will take you direct to the correct More >

**about 10 years ago** - Comments Off

Jumbo 3D sudoku puzzleI haven’t posted for a while so I thought I should post one of my new puzzles. This one is a Jumbo 3D Sudoku, where the aim is simply to place 1 to 9 into each black-lined 3×3 area as well as each of the 54 rows indicated by the coloured lines. More >

**about 10 years ago** - Comments Off

Valentine SudokuA quick heart-shaped sudoku for Valentine’s Day. Just place 1 to 9 once each in every row, column and bold-lined box.

**about 10 years ago** - Comments Off

Sudoku Xtra 24 is now finally available! It’s packed with 130 puzzles of a wide range of types, including a huge variety of sudoku variants.

This issue I’ve included a very wide range

of variants, including some new ones such as Two-grid Interconnected Sudoku, Mystery Multiple

Sudoku and Blackout Sudoku. Meanwhile I’ve made an effort to include More >

**about 10 years ago** - Comments Off

Sudoku Christmas Star puzzleA Sudoku, in a star shape.

Just that. (Place 1-9 once each into every row, column and bold-lined 3×3 box).

**about 11 years ago** - Comments Off

I’ve recently launched a new series of ‘101 Giant Sudoku’ books, to cater for those who like their Sudoku to be considerably larger than normal!

You can see the entire series at PuzzleBooks.org (scroll to the bottom) or visit Amazon and search for “101 giant sudoku”.

There are currently 12 books in the series: 14×14, 15×15, 16×16, 18×18, More >

**about 12 years ago** - Comments Off

Just a quick heads-up that PuzzleMix, my site where you can play a wide range of puzzles online, now supports touch screen play for all of the number entry puzzles – so that’s Sudoku, Killer Sudoku, Futoshiki, Calcudoku, Skyscraper, Sudoku X, Kropki Sudoku, Killer Sudoku Pro, Jigsaw Sudoku, Consecutive Sudoku, Wraparound Sudoku, Sudoku XV, Killer More >

**about 12 years ago** - 1 comment

Little-Killer Sudoku 9×9 1 puzzleIn Little-Killer Sudoku the total of each of the diagonals in the grid, other than those 9 cells long, is given. Each number has an arrow next to it which points to the diagonal it gives the sum of, so therefore the top-left cell in this grid must be a 9 More >

Spittledungabout 14 years ago

Finally got it … but did NOT enjoy this one.

I don’t see how you could say “It eliminates lots of possibilities from squares relatively quickly, so you’re left with more deductive logic and less pencil-mark housekeeping.” … I had to eventually use a loop technique to crack it. Of course I probably missed something as usual … but it was very frustrating. Makes me not look forward to the one in Issue 4.

I was also frustrated with 2-away consecutive sudokus as well. In those the adjacent numbers paired up into EVEN/EVEN or ODD/ODD (rather than ODD/EVEN), but at least you knew the range of numbers given one of the digits.

So going on from what you have told us:

1. The only way for the sum to be odd is if one of the numbers next to the O is odd and the other is even.

2. There are 5 odd numbers and 4 even numbers per row/column/region. (As usual)

….is there something else I am missing that might help me solve these?

about 14 years ago

Thanks very much for the feedback on this one – it’s extremely useful because now I know that these larger ones aren’t as enjoyable, so I will avoid them in future. This particular puzzle had some quad sets in I think, but I don’t really remember now.

Interesting point to compare it to Two-away or Consecutive Sudoku – all these “relationship X between two squares” puzzles (and there are lots of other variants) work on similar lines of course. The secret (as a creator) is to find the sweet-spot where the extra information rewards rather than creates extra work – in this puzzle it obviously went too far towards the latter.

The only other implication of the 4/5 break-down I was inferring is simply that in all the ones I solved myself I found that I ended up with lots of pairs, triples and quads, but much more clearly signalled than in a regular puzzle.