Sudoku Xtra. Packed with Puzzles! >> The Logic Puzzle Brain Workout. >> Daffodil Samurai Sudoku

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1 Sudoku Xtra TM ugust ll puzzles by Dr Gareth Moore ecept where otherwise credited For back issues and subscriptions, isit >> Daffodil Samurai Sudoku Full instructions on page. >> The Logic Puzzle rain Workout Packed with Puzzles! Dr Gareth Moore Issue

2 Sudoku Xtra Welcome to Sudoku Xtra, containing top-quality logic puzzles of a wide range of types, with a particular focus on Sudoku ariants. ll of the puzzles are language-neutral and hae a unique solution which can be found ia sensible logical deduction, with guessing neer required. This issue I e introduced seeral new Sudoku ariants, from the daffodil design on the coer onwards! There s rrow Sudoku, nti-king Sudoku, Quad lue Sudoku, rgyle Sudoku, Frame Sudoku, Little Killer Sudoku, Etra Region Pointers Sudoku, Offset Sudoku, a huge Odd/Een Samurai -grid Sudoku and een more plus most of the new arieties introduced in Sudoku Xtra are back too, including Sudoku XV, Kropki Sudoku, Non-onsecutie Sudoku and others. Tapa and LITS puzzles also return this issue, along with many eisting faourites. If there s anything you d like to see in a future issue, just let me know - for eample this issue Inequality Sudoku returns following requests on the forum. There are also links on the website to other issues, as well as details of how to subscribe to the PDF ersion. ll issues are also on all maz on stores worldwide. >> Hashi Join circled numbers with horizontal or ertical lines. > Each number must hae as many lines connected to it as specified by its alue. > No more than two lines may join any pair of numbers. > No lines may cross. > The finished layout must allow you to trael from any number to any other number just by following one or more lines. >> Daffodil Samurai Sudoku Place to once each into eery row, column and marked bo of each of the fie underlying grids. > The alue of the digits along each shaded thermometer must increase cell by cell from the bulb (lowest alue) to the head (highest alue). This also means that digits cannot be repeated in a thermometer. > The eample shows how the thermometers work on a single grid. Dr Gareth Moore gareth@sudokutra.com Sudoku Xtra, ugust. Published by and opyright Dr Gareth Moore. See for printed or download copies of other issues, or Gareth@SudokuXtra.com. No unauthorised reproduction in any form permitted. You may print or reproduce copies for your personal use only.

3 Sudoku Xtra >> Yajilin Draw a single loop using only horizontal and ertical lines such that the loop does not pass through any cell more than once. > ny cells which the loop does not isit must be shaded, but none of these shaded cells can touch in either a horizontal or ertical direction. > Numbers with arrows indicate the eact number of shaded cells in a gien direction in a specific row or column, but not all shaded cells are necessarily identified with arrows. The net Sudoku Xtra, issue, is due out in October. Issues are aailable immediately on www. SudokuXtra.com (download), then on maz on (printed) in the following days. The latest download or pre-printed links are always aailable at www. SudokuXtra.com/magazines.php Dr Gareth Moore Issue

4 Sudoku Xtra >> alcudoku Place the numbers to (or to ) once each into eery row and column of the grid, while obeying the alcudoku region totals. > The alue at the top-left of each bold-lined region must be obtained when all of the numbers in that region hae the gien operation (+, -,, ) applied between them. For - and operations start with the largest number in the region and then subtract or diide by the other numbers. > Remember that you can repeat a number within a bold-lined region, unlike in Killer Sudoku, so long as you obey the row/column restraints Dr Gareth Moore Issue

5 Dr Gareth Moore Issue Sudoku Xtra >> Slitherlink Draw a single loop by connecting together the dots so that each numbered square has the specified number of adjacent line segments. > Dots can only be joined by straight horizontal or ertical lines. > The loop cannot touch, cross or oerlap itself in any way.

6 Sudoku Xtra >> onsecutie Sudoku Place to once each into eery row, column and marked bo, while obeying the white consecutie markers between certain cells. > onsecutie markers indicate all adjacent cells with consecutie numbers, such as &, & or &. > Don t forget that cells without a white marker between are not consecutie. Dr Gareth Moore Issue

7 Dr Gareth Moore Issue Sudoku Xtra >> Hitori Shade in cells so that no number or letter occurs more than once per row or column. > Shaded cells cannot touch in either a horizontal or ertical direction. > ll unshaded cells must form a single continuous area.

8 Sudoku Xtra Dr Gareth Moore Issue >> Sudoku XV Place to once each into eery row, column and bo. > ll pairs of neighbouring cells which sum to are marked with a. > ll pairs of neighbouring cells which sum to are marked with an.

9 Sudoku Xtra >> Samurai Star Place to once each into eery row, column and marked bo of each of the fie underlying grids. > Don t forget the hidden fifth Sudoku grid in the centre of the puzzle. Dr Gareth Moore Issue

10 Sudoku Xtra >> Odd/Een -grid Samurai Sudoku Place to once each in eery row, column and bo of each of the thirteen grids. > Shaded cells always contain een digits; unshaded cells always contain odd digits. > Note that, as in a regular Samurai, only the rows and columns within the underlying grids are guaranteed to contain all of -. ny row or column not entirely within a single grid has no restriction on its content. Dr Gareth Moore Issue

11 Sudoku Xtra >> Hashi Join circled numbers with horizontal or ertical lines. > Each number must hae as many lines connected to it as specified by its alue. > No more than two lines may join any pair of numbers. > No lines may cross. > The finished layout must allow you to trael from any number to any other number just by following one or more lines. Dr Gareth Moore Issue

12 Sudoku Xtra >> Jigsaw Sudoku Place to, or once each into eery row, column and bold-lined jigsaw region. Dr Gareth Moore Issue

13 Sudoku Xtra >> rrow Sudoku Place - once each into eery row, column and bold-lined bo. > Digits in circled cells must be equal to the sum of the digits along their attached arrows. Dr Gareth Moore Issue

14 Sudoku Xtra >> Kakuro Place a digit from to into each white cell to sole the clues. > Each horizontal run of white cells adds up to the total aboe the diagonal line to the left of the run, and each ertical run of white cells adds up to the total below the diagonal line aboe the run. > No digit can be used more than once in any run. Dr Gareth Moore Issue

15 Dr Gareth Moore Issue Sudoku Xtra >> Futoshiki Place to,, or once each into eery row and column while obeying the inequality signs. > Less than ( < ) and greater than ( > ) signs between some cells indicate that the alues in these two cells must be greater than or less than one another as indicated by the sign. The sign always points towards the smaller number.

16 Sudoku Xtra >> Killer Sudoku [Zero] Place each of to into eery row, column and bo while obeying the cage totals. > The contents of each dashed line cage must sum to the total gien at the top-left. > You cannot repeat a number within a dashed line cage. > In the bottom-right Zero puzzle not all cells are coered by cages. Dr Gareth Moore Issue

17 Sudoku Xtra >> Skyscraper Place each of to, to or to into eery row and column. > Each number in the completed grid represents a building of that many storeys. Place the buildings in such a way that each gien number outside the grid represents the number of buildings that can be seen from that point, looking only at that number s row or column. > building with a higher alue always obscures a building with a lower alue, while a building with a lower alue neer obscures a building with a higher alue. Dr Gareth Moore Issue

18 Sudoku Xtra >> Kropki Sudoku Place to once each into eery row, column and marked bo. > Two cells with a black dot between contain numbers where one is twice the alue of the other. > Two cells with a white dot between contain consecutie numbers, such as & or &. > ll possible black/white dots are gien. > etween & either a white or a black dot is used. Dr Gareth Moore Issue

19 Sudoku Xtra >> SOS: Samurai Outside Sudoku Place to once each into eery row, column and bo of each of the underlying fie Sudoku grids, while obeying the outside clues. > Numbers outside the grid must be placed into the first three cells in the releant row or column, but not necessarily in the order gien. > See the two-grid eample solution on the left to see how this works. Dr Gareth Moore Issue

20 Sudoku Xtra >> SSSS: Skyscraper Samurai Star Sudoku Place to once each into eery row, column and marked bo of each the fie underlying grids, while obeying the Skyscaper clues. > Don t forget the hidden fifth Sudoku grid in the centre of the puzzle. > See page for instructions on soling Skyscraper clues. Dr Gareth Moore Issue

21 Sudoku Xtra >> Quad lue Sudoku Place - once each into eery row, column and bold-lined bo. > Whereer four digits are gien on the intersection of four cells then these four digits must be placed into those four cells in the gien distribution. It is up to you to work out which digit goes into which cell. Dr Gareth Moore Issue

22 Sudoku Xtra >> Hanjie Shade in cells in the grid to reeal a picture while obeying the clue constraints at the start of each row or column. > Numbers outside proide, in order, the length of eery run of consecutie shaded cells in each row or column. > There must be a gap of at least one empty cell between each run of shaded cells in the same row or column.,, lue (top): Round and round lue (bottom): lack and white pals,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Dr Gareth Moore Issue

23 Dr Gareth Moore Issue Sudoku Xtra >> Dominoes an you place a full set of dominoes into each grid? > Draw along the dashed lines to indicate where each domino is placed. > Use the chart to check off dominoes you e already placed. > represents a blank on a domino. > Each domino occurs eactly once in each grid.

24 Sudoku Xtra >> Sudoku Variety Pack Place to once each into eery row, column and bold-lined region. > Puzzle : Regular Sudoku > Puzzle : Obey the inequality signs: arrows points to smaller numbers > Puzzle : Toroidal jigsaw - regions wrap around the outside of the grid > Puzzle : No digit can repeat on either of the two grey main diagonals > Puzzle : White bars show LL consecutie alue neighbours (e.g.&) > Puzzle : Killer Sudoku Pro (see P.; no digits repeat in any killer cage) Get new puzzles eery day on my interactie puzzle website: Dr Gareth Moore Issue

25 Sudoku Xtra >> Sudoku Etra Region [Points] [Squares] Place to once each into eery row, column, shaded area and boldlined bo. Dr Gareth Moore Issue

26 Sudoku Xtra >> LITS Shade four touching cells in each bold-lined region to form one of the four tetrominos: L, I, T or S. L I T S > Identical tetronimos cannot touch (share an edge). Tetronimos can be reflected or rotated, but different rotations/reflections still count as the same tetronimo. > There can be no solid area of shaded cells anywhere in the grid. > The shaded cells must form one continuous area. LITS For more Sudoku ariants check out my puzzle blog at Dr Gareth Moore Issue

27 ??????????????????????????????? Sudoku Xtra >> Mystery Killer Sudoku Pro [Zero] Place - once each into eery row, column and bold-lined bo. > No digit may be repeated in any dashed-line cage, and each dashedline cage must result in the gien alue when a particular operation is applied between all of the digits in that cage. That operation may be addition, subtraction, multiplication or diision it is up to you to work out which. > For subtraction and diision operations, start with the highest digit in the cage and then subtract or diide by the other digits in that cage. > In the final Zero puzzle not all cells are coered by cages.???????????????????????????????????????????????????????????????????????????????????????????????????????????????????? Dr Gareth Moore Issue

28 Sudoku Xtra >> rgyle Sudoku Place - once each into eery row, column and bold-lined bo. > No digit can be repeated along any marked diagonal line. Dr Gareth Moore Issue

29 Sudoku Xtra >> nti-king Sudoku Place - once each into eery row, column and bold-lined bo. > No two identical digits can touch diagonally. Dr Gareth Moore Issue

30 Sudoku Xtra >> Sudoku Place to and to once each into eery row, column and bold-lined bo. >> Subscribe Now! Issue of Sudoku Xtra is out in October, so isit for notification of future issues, or subscribe now to sae money and beat any future price rise! (Only download copies, not printed copies, are aailable ia subscription) Dr Gareth Moore Issue

31 Dr Gareth Moore Issue Sudoku Xtra >> Sudoku Place to and to F once each into eery row, column and bold-lined bo. F E D F E D D E F F E D D E F F D E E F D F D E D E F D F E E F D F E D E D F F D E E F D >> Sudoku Place to and to G once each into eery row, column and bold-lined bo. E F G D G D E F G D F E D E F G G E F D F E G D G D E F F D G E E D F G D F G E G F E D G E F D E D G F E F G D D E F G F G D E F D F F D E F D E D F E D F D E F D F D E G D E G G E G D F F D F D E G D F D G E G E F If you re a fan of giant Sudoku puzzles then check out the Sudoku Xtra Specials series on - books of Sudoku,,,, and are now aailable.

32 Sudoku Xtra >> Worm Sudoku Place - once each into eery row, column and bold-lined bo. > The alues of the digits along each worm must decrease by eactly in each cell from the head (marked with eyes) to the tail. For eample, is alid but is not. Dr Gareth Moore Issue

33 Sudoku Xtra >> Frame Sudoku Place - once each into eery row, column and bold-lined bo. > Values outside the grid reeal the sum of the first three cells in the adjacent row or column. Dr Gareth Moore Issue

34 Sudoku Xtra >> Offset Sudoku Place - once each into eery row, column, bold-lined bo and offset region > There are nine offset regions, each one consisting of the set of nine cells that are in the same relatie position in a bo. So, for eample, the nine cells each in the top-left position of a bo together form one offset region, and the nine cells each in the centre of a bo form another. Dr Gareth Moore Issue

35 Sudoku Xtra >> Kakuro Place a digit from to into each white cell to sole the clues. > Each horizontal run of white cells adds up to the total aboe the diagonal line to the left of the run, and each ertical run of white cells adds up to the total below the diagonal line aboe the run. > No digit can be used more than once in any run. Dr Gareth Moore Issue

36 Sudoku Xtra >> Thermometer Sudoku Place - once each into eery row, column and bold-lined bo. > The alue of the digits along each shaded thermometer must increase cell by cell from the bulb (lowest alue) to the head (highest alue). This also means that digits cannot be repeated in a thermometer. Dr Gareth Moore Issue

37 Sudoku Xtra >> Non-consecutie Sudoku Place - once each into eery row, column and bold-lined bo. > No two adjacent cells may contain consecutie numbers, such as & or &. Dr Gareth Moore Issue

38 Sudoku Xtra >> Tapa Shade some empty cells to create a continuous region that obeys the clues. > The clues reeal the count of neighbouring shaded cells: considering the cells (or less at the edges) around a clue as a circular region, the clues gie the length of all shaded sets of cells in that region. If there are multiple numbers in a clue cell then the different shaded sets of cells must hae at least one unshaded cell between them. > Tapa clues cannot themseles be shaded, and there can be no shaded regions. Dr Gareth Moore Issue

39 Sudoku Xtra >> Nurikabe Shade in cells so that eery number in the puzzle remains as part of a continuous unshaded area of precisely the gien number of cells. > There can be only one number per unshaded area. > Shaded cells cannot form any solid (or larger) areas. > ll the shaded cells must form one continuous area. heck out the discussion forums at com/forum to chat about these and other puzzles with fellow readers! Dr Gareth Moore Issue

40 Sudoku Xtra >> [Jigsaw] Sudoku Inequality Place to or into each row, and column and bold-lined region while obeying the inequality signs. > Less than ( < ) and greater than ( > ) signs between some cells indicate that the alues in these two cells must be greater than or less than one another as indicated by the sign. The sign always points towards the smaller number. > In the right-hand two puzzles irregular jigsaw shapes replace the boes. Dr Gareth Moore Issue

41 Sudoku Xtra >> Little Killer Place - once each into eery row, column and bold-lined bo. > The sum of some diagonals is gien, with an arrow pointing to the diagonal the sum applies to. > Note that numbers are allowed to repeat in a diagonal sum, subject to the usual rules of Sudoku. Dr Gareth Moore Issue

42 Sudoku Xtra,, >> Hanjie Shade in cells in the grid to reeal a picture while obeying the clue constraints at the start of each row or column. > Numbers outside proide, in order, the length of eery run of consecutie shaded cells in each row or column. > There must be a gap of at least one empty cell between each run of shaded cells in the same row or column. lue: Night-time walk,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Dr Gareth Moore Issue

43 Sudoku Xtra >> Feedback If there are certain puzzles you d like to see - or een not see! - in a future issue of Sudoku Xtra then why not send me an and let me know? Just write to Gareth@SudokuXtra.com. lternatiely head on oer to the Sudoku Xtra discussion forums at forum and join in the puzzle discussion. For eample if you re stuck on a puzzle, why not ask for help? There are also announcements posted periodically giing details of future issues or related content, such as the Sudoku Xtra Specials books of particular Sudoku ariants. >> Getting hold of Sudoku Xtra Issue will be aailable in October, but if you don t already hae all twenty issues of Sudoku Xtra then there s no need to wait for more - just head oer to and you can get hold of the preious issues too! Each issue is aailable online for immediate download, or you can obtain a pre-printed copy from maz on (with free super-saer shipping, if eligible). >> Xtra alcudoku Place to once each into eery row and column. > alcudoku cages are gien, where as usual there is no restriction on repeating a number within a cage but the gien alue must result when the stated operation is applied between all the numbers in that cage. > ircled multiplication symbols indicate all adjacent cells where one cell is an integer multiple of the other, such as & or & for eample Dr Gareth Moore Issue

44 Sudoku Xtra Puzzles by Elliott Line Elliott is the editor of Enigma, the International Puzzle Magazine for members of Mensa >> Third enue Draw a path that isits eery dot once only. > The path can be made only of horizontal and ertical lines. > The path cannot cross itself or branch off, and must return to the start to form a complete circuit. > Eery third turning point in the circuit path has been marked by a triangular symbol. Puzzles on this page copyright as credited aboe. Magazine Dr Gareth Moore Issue

45 Sudoku Xtra Puzzles ommunity by Serkan Puzzles Yurekli >> Easy as Japanese Sums Place the digits to in some empty cells so that each digit appears eactly once in each row and column. > lues outside the grid indicate the sum of the first set of digits encountered from the edge of the grid in the adjacent row or column. Digit sets are bounded by an empty cell or the edge of the grid, and need not touch the grid edge. yureklis.wordpress.com Puzzles on this page copyright as credited aboe. Magazine Dr Gareth Moore Issue >> Slash Pack Diide the grid into arious shapes by adding diagonal lines to some cells, such that each shape contains all of the numbers to once each ( to in the eample). > Lines must join to each other or the edge of the grid at both ends. > Two diagonals cannot cross in a single cell.

46 Sudoku Xtra Puzzles by Jim umgardner krazydad.com/puzzles >> Krypto Kakuro Krypto Kakuro puzzles are a cross between a crossword, a sudoku and a cryptogram. > Each digit has been substituted with a letter. To sole the puzzle, you must figure out what digit each letter stands for, and then sole it like a regular kakuro puzzle. DH IJ D I E D E E J F E F DH KrazyDad.com IJ J > Each word in the crossword contains only the digits thru, and the same digit will neer repeat within a word. The sum of the digits of each word are shown on the left and right sides of across words, and at the tops and bottoms of down words. D E F G H I J D E F G H I J I GG D E F G H I J I EI DI I EI D J F I D I GG D F GH H D I D E D I EI G E II EJ G I EI EJ D E E GD J G E G KrazyDad.com G H GD G GH F EE DD DI F EE E E DI DI E F EE II EE E KrazyDad.com DD Puzzles on this page copyright as credited aboe. Magazine Dr Gareth Moore Issue

47 Sudoku Xtra KrazyDad.com >> ltair Slitherlink Fill in some of the dotted line segments to form a meandering path that forms a single loop. > The path does not cross itself, branch, or touch itself at corners. The numbers indicate how many line segments surround each cell. Empty cells may be surrounded by any number of line segments. This tiling is from a traditional Islamic design and appears in the books ltair Design by E. Holiday and rabic Geometrical Pattern and Design by J. ourgoin. Need some soling help? Visit krazydad.com/slitherlink Puzzles on this page copyright as credited aboe. Magazine Dr Gareth Moore Issue ommunity Puzzles Puzzle by Jim umgardner krazydad.com/puzzles

48 Sudoku Xtra Puzzles by larity Media >> attleships Locate the position of each of the listed ships in the grid. Ships are horizontal or ertical only. > Numbers around the edge tell you the number of ship segments in each row and column. > Ships are surrounded on all sides by water (empty cells), including diagonally. Puzzles on this page copyright as credited aboe. Magazine Dr Gareth Moore Issue

49 Sudoku Xtra Puzzles by Veus ommunity Puzzle Puzzles Design >> Tiktaka Find a path from the entrance to the eit of each grid such that each pair of grids has the same path for each shape. > Eery path must pass through each shape eactly once. > Each grid in the pair consists of the same set of shapes. The route through each shape must follow an identical path in both grids. > Shapes, and therefore their paths, may be rotated or reflected between a grid and its pair. Puzzles on this page copyright as credited aboe. Magazine Dr Gareth Moore Issue

50 Sudoku Xtra Puzzles by Serkan Yurekli yureklis.wordpress.com >> Snail Sudoku Place - into some empty cells so that each digit appears eactly once in each row, column and bold-lined spiral. > Digits must be placed in increasing numerical order within each spiral, from the outside to the centre. > Digits cannot be placed in cells marked with a Puzzles on this page copyright as credited aboe. Magazine Dr Gareth Moore Issue

51 Sudoku Xtra >> Solutions for pages to For more puzzles check out If you re enjoying the ariety of puzzles in each issue of Sudoku Xtra then why not sae a bit of money by signing up for a subscription on nd that way you ll be automatically ed each new issue, fresh off the irtual press! Dr Gareth Moore Issue

52 Sudoku Xtra >> Solutions for pages to Dr Gareth Moore Issue

53 >> Solutions for pages to Sudoku Xtra Dr Gareth Moore Issue

54 Sudoku Xtra >> Solutions for pages to Play Nurikabe, Hanjie, Slitherlink, onsecutie Sudoku, Odd Pair, Killer, Hitori, Kakuro, Skyscraper, Jigsaw, Futoshiki and more at: Dr Gareth Moore Issue

55 >> Solutions for pages to Sudoku Xtra ircular arrows Penguins Nurikabe is the latest puzzle added to puzzlemi.com For more Sudoku ariants check out my puzzle blog at Dr Gareth Moore Issue

56 Sudoku Xtra >> Solutions for pages to???????????????????????????????????????????????????????????????????????????????????????????????????????????????????? D F E F E D E F D E F D E F D D E F F D E E D F E D F D F E E D F F D E F E D F D E D E F Sudoku Xtra is now aailable pre-printed from international maz on stores, including not just the US.com store but also the ritish.co.uk, French.fr, German.de, Italian.it, Spanish.es and anadian.ca. Find direct links to each issue easily ia Dr Gareth Moore Issue

57 Sudoku Xtra >> Solutions for pages (continued) to E G D F G D F E F D E G F G E D F E G D D G F E E G F D D G E F D F E G G D E F F E D G E G F D D E F G F D G E F G E D G E F D puzzlemi.com puzzlemi.com Dr Gareth Moore Issue

58 Sudoku Xtra >> Solutions for pages to Dr Gareth Moore Issue

59 >> Solutions for pages to at on a roof # # Sudoku Xtra # Thanks for buying Sudoku Xtra! Dr Gareth Moore Issue

60 Sudoku Xtra >> Sudoku Xtra Specials Special-edition issues of Sudoku Xtra featuring a single puzzle type are also aailable. Download in PDF form from or pre-printed from your local maz on store. ll pre-printed ersions are supplied on large, high-quality paper. >> onsecutie Sudoku Packed with beautiful and attractie puzzle designs of this popular Sudoku ariant, this book will both delight and frustrate you on eery page! >> hristmas Hanjie: Festie Picture Puzzles This special themed book of Hanjie logic puzzles also includes full soling instructions and an introductory guide to Hanjie puzzles. holiday season scene or picture is reealed as you sole each puzzle, with a cryptic clue alongside each puzzle to gie you a small hint as to what is concealed within. No matter the time of year, with big puzzles and een larger puzzles there s plenty here to keep you busy! >> Easy Jigsaw Sudoku If you re a fan of twisted Sudoku, then Easy Jigsaw Sudoku is for you - a whole book packed full of different symmetrical designs of Jigsaw Sudoku, and each guaranteed to require only the easiest logic to complete. e warned: the logic may be easy but the puzzles certainly take some skill! >> Sudoku Volumes and If you like your Sudoku to be bigger than then you might enjoy Sudoku Volume and Volume, packed with an incredible Sudoku puzzles! >> Sudoku,,, & Vols - If you enjoy large or een giant Sudoku puzzles then you ll loe these books! Printed at large format size, and featuring carefully crafted,,, or Sudoku, each puzzle is attractiely presented in a range of symmetric patterns. The eact number of olumes aries by title, but there are olumes of the most popular and arieties. ll of these Sudoku puzzles hae a sensible logical solution - eery puzzle can be soled by nothing more comple than simply scanning the rows, columns and boes, without haing to make any pencil mark notes. Dr Gareth Moore Issue