cool have seven sizes of “3x3,4x4,5x5,6x6,7x7,8x8,9x9” with ten difficulty levels. Enter the numbers of the puzzle you want to solve in the grid. 5 levels of difficulty. The sizes of regular sub-XV Jigsaw Sudoku is an easy but fun sudoku variation where the neighbour cells that add up to 5 have Roman five (v) in between. Test results on modified Jigsaw Sudoku (9 blocks) and Hypersudoku (13 blocks) also show its success in deriving the solutions by execuring 9 and 13 times respectively. Play unlimited sudoku puzzles online. These rules are very similar to the normal Sudoku rules, but where in a normal Sudoku puzzle each region is a 3x3 square, they can be any shape in a Jigsaw Sudoku puzzle. $5. Jigsaw Sudoku Adult Puzzle Book: 500 Medium (9x9) Puzzles : Keep Your Brain Young (Jigsaw Sudoku Puzzle Books Series) Dr. To enter a new puzzle click a cell and select a number for that cell. [2] Getting Started. Click on Take Step to step through the solution. Samurai sudoku puzzles consist of five overlapping sudoku grids. 3) Long press in Favourites allows deletion of that puzzle. You can enter a new Killer puzzle using the new 'designer' - click on " Enter new Killer ". [11] Variants - A nonomino or Jigsaw Sudoku puzzle, as seen in the Sunday Telegraph - Solution numbers in red for above puzzle Although the 9×9 grid with 3×3 regions is by far the most common, many variations exist. These jigsaw-regions, like the boxes, are always the same size. Unfolded cube. 🔢 Get an amazing game experience: More than 12000 classic well-formed sudoku games with numbers. Join AARP. Groovepad - music & beat maker. What makes it more interesting aside from you will be able to play a hand-cut jigsaw puzzle is that there is no provided guide picture as to what you are going to assemble!Jigsaw Sudoku is a logic puzzle with simple rules and challenging solutions. Create, solve, share and compete at Jigidi. The rules of Tents are simple: - Pair each tree with a tent adjacent horizontally or vertically. What is sudoku? Sudoku is defined by Merriam-Webster as a 9-by-9 grid puzzle in which the grid is divided into 3-by-3 boxes. In order to use this solver you need to pick the correct grid shape from the list above. The solver will set that candidate as true and turn false all the candidates it can see in the row, column and box. 49 KB. An archive is in the making. Instead, the puzzles are divided into a. All cages must add up to 405. I do hope you enjoy them as much as I have in creating them. 0. 4. In a traditional sudoku grid, there are also equally sized and shaped areas that must follow the same rule. In this App, you can test your Sudoku solving skills on Jigsaw Sudokus, where the standard 3 x 3 blocks are replaced by random shapes of 9 cells. Futoshiki. Nếu ta lần theo hàng và cột của từng ô trống và thấy xuất hiện số 5 ở nơi khác, người chơi có thể loại trừ các ô mà không thể. The faster you solve, the higher your score. You can place notes, find sudoku tips, manage the timer and save the sudoku game by clicking the menu bar in the top-right corner. 台灣數獨發展協會（Taiwan Sudoku Association，簡稱TSA）亦為世界解謎聯盟會員。香港則是由《am730》於2005年7月30日創刊時引入數獨。中国大陆是在2007年2月28日正式引入数独。北京晚报智力休闲数独俱乐部（数独联盟前身）在新闻大厦举行加入世界谜题联合会的颁证. The Sudoku, Sudoku X and Jigsaw are compatible with my Step-by-Step solvers. 1 Monetization; 2 Game data. Click on Take Step to step through the solution. One of the most often suggested free DIY escape room puzzle ideas is to padlock a pair of scissors. Sudoku, Nonograms, Hashi, Network, Nurikabe, Minesweeper and more!Jigsaw Sudoku. 4. 1 Configuration file(s) location; 2. . Choose from over 150,000 puzzles. This is getting the Sudoku X and Jigsaw Sudoku solvers into the app. Strategies for Sudoku, Sudoku X, Killer Sudoku and Jigsaw Sudoku - and the home of logical puzzle maker Andrew Stuart. Jigsaw puzzles became popular during the 18th and early 19th centuries in England as educational tools, particularly to teach geography. It should be easier to spot in a game as we can concentrate on just one number at a time. Jigsaw Sudoku. 16×16 Giant Sudoku. Games in the DS Puzzle Series are: Vol. 80,000 sudoku jigsaw to play at your choice. Number 1-9 can only appear once in each column. We would like to show you a description here but the site won’t allow us. This Jigsaw Sudoku can be completed directly on the web page - just enter numbers in the cells. Only then type the numbers into the small grid, use the Import button or pick an example from the example list. Jigsaw Sudoku Puzzle Book is a collection of 500 Jigsaw sudoku puzzles. This tough puzzle has two Hidden Triples: the first, marked in red, is in row A. Jigidi is a community that runs on curiousity, creativity and kindness, and we have guidelines we steer by. BUG. Neke najpoznatije vrste su Jigsaw Sudoku, Killer Sudoku, Skyscraper Sudoku, Sudoku-X te Samurai Sudoku. In the first, for example, a clue of 3 in a cage of size 2. 12×12 Giant Sudoku. Welcome to TheJigsawPuzzles. . org. Play unlimited sudoku puzzles online. Hide All Candidates. Once you fill in the clues and set up the cages correctly it can be solved. Input a puzzle, or partially completed puzzle, and click "Print" for a printable page. Your objective is to fill the rest of the fields without breaking the constraints that each. The Daily Jigsaw Sudoku puzzle by Andrew Stuart. The rules are the same as for a classic sudoku. The Sudoku, Sudoku X and Jigsaw are compatible with my Step-by-Step solvers. A nonomino or Jigsaw Sudoku puzzle, as seen in the Sunday Telegraph. 1 2 3 4 5 6 7 8 9 SCORE: 0 Create [P]encil marks Clear Pencil Marks [X] [R]eset Puzzle [S]ave Puzzle Print version Jigsaw Sudoku leaderboard All-time leaderboard Rank. There are two ways one can group all the strategies for Sudoku: by difficulty and by family. Play medium Sudoku puzzles online on Sudoku. X-Cycles are the start of a large family of 'chaining strategies' which are fundamental to solving the harder Sudoku puzzles. Click in the cell you want to solve first, then click this button. Colour Sudoku is the puzzle as normal Sudoku with an extra constraint. 5 star. Samurai Sudoku is a Sudoku variation that has 5 overlapping Sudoku grids. 2: CROSSWORD, released March 23, 2006 in Japan [1] Vol. Star Battle Puzzles by KrazyDad. If any one number occurs twice or three times in just one unit (any row, column or box) then we can remove that number from the intersection of another unit. A grid has 9 rows, 9 columns and 9 boxes, each having 9 cells (81 total). Overall, John is the main. Jigsaw Sudokus are the same as normal sudoku except for the shapes of the boxes. . Intermediate Jigsaw Sudoku, Volume 1. Each column must contain. Brought to you by game experts from a top developer, it is a simple yet challenging and addictive free block puzzle you won’t be able to put down. To associate your repository with the jigsaw-sudoku topic, visit your repo's landing page and select "manage topics. Create, solve, share and compete at Jigidi. Samurai Sudoku. It's very useful to split out chain-like strategies into X-Wings, XY-Chains, Forcing Chains, XYZ. Some strategies cannot be used (see below) but there is one important addition: The Law of Leftovers. Paperback $7. Once you fill in the clues and set up the cages correctly it can be solved. Guaranteed a single solution - and a logical path to solve. Each puzzle consists of a 9x9 grid containing numbers in various squares. a. Includes Crossword, Quick Cross, & Sudoku. 2. Train your brain by playing free offline sudoku game without any ads or any IAP. Daily Jigsaw Sudoku SudokuWiki . - Tents never touch each other even diagonallyUse 3D chains. Fig. See the Step-by-step solver for tips and strategies. However, there is one rule that you will find yourself using a lot more than in normal sudoku and that is region intersection elimination. This Jigsaw Sudoku book is packed with the following features: ① 1000 Medium Jigsaw Sudoku Puzzles. To check you have entered a correct puzzle press validate. Sudoku is consisted of 9x9 grids. The Daily Jigsaw Sudoku puzzle by Andrew Stuart. Compatible with all browsers, tablets and phones including iPhone, iPad and Android. Keep track of your progress and stats. 10 best printable sudoku puzzles to print. Every puzzle from the easiest to the hardest requires simple 'eyeballing' to detect the easy solutions. Terminology and grid layout. Basierend auf dem normalen Jigsaw Sudoku bzw. Use the "Import a Windoku" button or type in a Sudoku puzzle in the small board. Suko is a Trademark owned by Jai Kobayaashi Gomer of Kobayaashi Studios. Englishman John Spilsbury, a London engraver and mapmaker, invented the jigsaw puzzle in 1767. To enter notes simply. He has published a book on the Logic of Sudoku and supports seven highly acclaimed step-by-step solvers. Welcome to the Daily Jigsaw Sudoku Puzzle. Boxes can also be called blocks or regions. org data below. com, Blockudoku, Jigsaw Puzzles, Art Puzzle, Number Match and others. Add and remove "pencil marks" by holding down the <Ctrl> or <alt> key. I wrote the app. How to play. Art Puzzle - Jigsaw Art Games. Empty Rectangles constitute a clever but obscure strategy for Sudoku. Play unlimited sudoku puzzles online. Fantastic!. Number 6592, Moderate by MM Multimedia. Just place the digits from 1 to 9 in each empty cell. 4. The rules of Jigsaw Sudoku are, Each row must contain the numbers 1-9 once, and only once. com finden Sie Jigsaw-Diagonal-Sudoku in sieben verschiedenen Größen von 4x4, 5x5, 6x6, 7x7, 8x8 bis 9x9 und zehn Schwierigkeitsgraden. As an example, a cage of 2 cells with a sum of 3 has only one possible combination: 1 or 2. Thermo Sudoku; CTC Fan Discord; CTC Catalogue; Resources & Utilities. There will always be 9 squares, but they could be any shape. The page "Enter an irregular Sudoku" was requested directly. About this game. [1] Three horizontally adjacent blocks are a band, and three vertically adjacent blocks are a stack. . The total for the top-left quadrant is 23, and the total for the blue cells is 14. Enter numbers in the. Unknown squares are filled with 'candidates' - possible solutions. Only then type the numbers into the small grid, use the Import button or pick an example from the example list. Dimensions. 2. com, an ever-growing collection of free online jigsaw puzzles. Every row, column and box must contain the numbers one through nine, no. org. This puzzle book starts out slow and easy with 25 easy sudoku. Paperback. Welcome to the Daily Jigsaw Sudoku Competition. January 29 is National Puzzle Day, the perfect day to do a little brain exercise. You can play Sudoku by Razzle Puzzles on your phone and tablet. Any cells that are reduced to one possible candidate are solved. A jigsaw puzzle (with context, sometimes just jigsaw or just puzzle) is a tiling puzzle that requires the assembly of often irregularly shaped interlocking and mosaicked pieces, each of which typically has a portion of a picture. Nikoli Puzzles. Our irregular Sudoku puzzles are 9 X 9 sudoku. The rules that you use in standard sudoku certainly apply, that there is 1 - 9 once in each row, column and in this case irregular shaped thick lined set of nine cells. 19. This is an example of a Jigsaw Sudoku. org. Blockudoku®: Block Puzzle Game. This is the first of many techniques that relies on proper pencil marking. Sudoku comfortable yetPrintable sudoku puzzles easy #6 Sudoku printablesudokufreeMedium printable sudoku puzzles 4 per-page. No 5337, Diabolical. Create and share puzzles using your own photos. Given: a blank Sudoku. Sudoku printable mathematics per wikipedia 2x2 25x25 easy puzzles 7x7 rules 5x5 web sum multiplication solutions zigzag chart worksheets printablesudokufree. FREE delivery Sat, Jul 22 on $25 of items shipped by Amazon. Pics Quotes Both Rewards. The grids print two to a page and the solutions are included at the back of the book, just in case you get really stuck. Go to:Play puzzles online or call the Previous page. Compatible with all browsers, tablets and phones including iPhone, iPad and Android. . Publication date. org. The total for the top-left quadrant is 23, and the total for the blue cells is 14. Day 1 - 28th January 2013 I have selected new puzzles for the Sudoku X samples. In the 18th century, jigsaw puzzles were created by painting a picture. Why? Because instead of a 3×3 square/region, in jigsaw sudoku, you will see irregular jigsaw. Students learned their geography lessons by putting the world maps. Судоку ( яп. Free online jigsaw sudoku puzzles. John Kramer, also known as The Jigsaw Killer or simply Jigsaw, is a fictional character from the Saw franchise. . X-Wing example 2 : Load Example or : From the Start In this second example I've chosen a Sudoku puzzle where an enormous number of candidates can be removed using two X-Wings. Play online, print a Sudoku, solve and get hints using the new improved Draw/Play function. An Empty Rectangle occurs within a box where four cells form a rectangle which does NOT contain a certain candidate. As shown in the picture above, two distinct features of a common jigsaw puzzle piece are named based on their appearance. Here's our sudoku example being solved by backtracking: Conclusion I had a lot of fun with this article and hope that you found it helpful for getting a basic understanding of backtracking. Jigsaw Sudoku #3 3 9 1 8 3 9 8 6 4 9 2 4 7 5 4 3 9 3 2 6 4 9 Challenging Jigsaw Sudoku by Krazydad, Volume 1, Book 29 For more puzzles, visit krazydad. Рішення головоломки не вимагає математичних розрахунків, але потребує терпіння і. 1. Jigsaw sudoku puzzles make a nice twist on the traditional format. Samurai Jigsaw Sudoku has five overlapping 9x9 grid. Use multiplayer mode to play with family and friends. Weight. Have fun and start playing today!Click on Take Step to step through the solution. . 5 star. Welcome to the Daily Jigsaw Sudoku Competition. The placement of numbers in a Sudoku puzzle has more impact on the difficulty than the quantity of the numbers. This particular puzzle has a 3x3 square in the. Boxes can also be called blocks or regions. Sudoku. net. by Andrew Stuart: 1: 2: 3: 4: 5: 6: 7: 8: 9This book is the new challenge you are looking for 200 Giant 16x16 Sudoku puzzles from the popular PuzzleMadness. Many puzzle games involve a real-time element and require quick thinking, such as Tetris (1985) and. Str8ts is available as a print puzzle for all newspapers, magazines and books at a reasonable price. Here are the common terms used to describe the basic parts of a jigsaw puzzle piece: Tabs and blanks. The process of solving Sudoku is filling numbers from 1-9 into 9x9 grids. 5. Instead, groups of cells form blocks or 'cages' - and the clue is the sum of the solutions to those squares. Each sub-region must contain the numbers 1-9 once, and only once. Our Irregular sudoku puzzle magazine, also referred to as Jigsaw Sudoku, has 100 all new irregular sudoku puzzles for you to enjoy. 5 star. External Links. Microsoft Sudoku - Games on Microsoft Start. This strategy can be even made more generic if there are more than 3 dimensions (special sudokus). All rights reserved. English. Jigsaw Sudoku: 200 Medium Jigsaw Sudoku Puzzles Volume 7. The name of this type of figure is formed with the prefix non(a)-. e. The solver will set that candidate as true and turn false all the candidates it can see in the row, column and box. If you're just starting out, selecting "pencilmarks" and/or "validity" might make things easier, and if you. Рішення головоломки не вимагає математичних розрахунків, але потребує терпіння і. BC and AC can see all the cells marked with a red C where this Y-Wing can eliminate whatever. Sudoku For Kids. row, column and box. Pixel Art - Color by Number. How to play: Use your arrow keys to move the tiles. Above and below the puzzle is the number selection. Death Blossom 1 : From the Start To get a feel for what’s going it worth working backwards from the elimination of 7 in C3 in this first example. As of July 2015 this strategy has been re-instated in the solver. But the logic of Jellyfish (and Swordfish) is that we only need four X in total over the four rows and columns. You have to find where the mines are. Language. To work on a sample puzzle select it from the list below. It can see a 1/2 in D9 and a 1/4 in F1. The sudoku board is broken down into. Killer is based on Sudoku, so ultimately you need to place the numbers 1 to 9 on all the cell so that 1 to 9 is unique in every row, column and box. It is another type of standard Sudoku. Each booklet contains a collection of eight different puzzles, 1-per-page, with a page of hints and a page of answers in the back. Microsoft Sudoku is bringing the classic game you love to a whole new light! The No. What is Jigsaw Sudoku? Jigsaw Sudoku is also referred to puzzle Sudoku. Different from standard Sudoku, jigsaw Sudoku uses irregular gridding groups to replace traditional 3x3 grids. Download this classic number game and play free sudoku for android. Most of our existing puzzles will remain on the website for the time being, but big changes are coming soon! Have an idea for a printable or video puzzle? Submit your idea in our Puzzle Lab. com. Best 3D Puzzles. Put your Sudoku skills to the test with Jigsaw Sudoku! This variant requires you to fill every row, column, and irregularly shaped region with numbers 1-9. However whereas standard Sudoku also has rectangular boxes that must each contain every number, in Jigsaw Sudoku these boxes. The modern puzzle was invented by an American architect, Howard Garns, in 1979 and published by Dell Magazines under the name "Numbers in Place. 1 | | '-----. The rules of Jigsaw Sudoku are simple: 1. We tackle a viewer-requested irregular/jigsaw Sudoku (also called nonomino or geometric Sudoku!). BUG stands for Bi-Value Universal Grave. 2048. Instead of the traditional numerical style, the puzzle is played on a 9x9 grid with symbols, and the houseguests must assure no column, row or grid has more than 1. Intermediate Jigsaw Sudoku, 4-per-page, Volume 1. 7 out of 5 stars 115. Different from standard Sudoku, jigsaw Sudoku uses irregular gridding groups to replace traditional 3x3 grids. Irregular Sudoku Jigsaw Sudoku Chaos Sudoku Nonomino Sudoku Toroidal Sudoku. The variants of this strategy depend on how many Imperfect connections there are in the loop. May 5, 2020. Thanks for supporting our site. I have not created many puzzles of 9x9 Jigsaw Sudoku type. Strategies for Sudoku, Sudoku X, Killer Sudoku and Jigsaw Sudoku - and the home of logical puzzle maker Andrew Stuart Read More What is Jigsaw Sudoku? Jigsaw Sudoku is also referred to puzzle Sudoku. Khối trên bên phải thiếu số 5. com, Nonogram. 558K subscribers Subscribe 24K views 4 years ago #crypticcracking We tackle a viewer-requested irregular/jigsaw Sudoku (also called nonomino or geometric. 2 (a) is an example. Advertisement. For example, perhaps players need to cut a string as part of a. Additional stat-tracking. The Daily Kakuro by Andrew Stuart. Most of our existing puzzles will remain on the website for the time being, but big changes are coming soon! Have an idea for a printable or video puzzle? Submit your idea in our Puzzle Lab. The process of solving Sudoku is filling numbers from 1-9 into 9x9 grids. 0. 5 x 11 inches). cool have seven sizes of 4x4,5x5,6x6,7x7,8x8,9x9 with ten. It is another type of standard Sudoku. We have a large collection of free printable puzzles. All entries must be in by 23:59 US Eastern Standard Time (time now is 10:05 am EST) Note: This web site will not be adjusting for daylight saving time and is permanently set to US EST (GMT-5)Did the hard puzzle today with Snyder notation and achieved a time of 11 minutes 21 seconds :) it had a nice rhythm to it. Here are hundreds of free Star Battle puzzles suitable for printing. com Fill in the blank squares so that each row, each column, and each jigsaw shape contain all of the digits 1 thru 9. [ Sudoku Solver ] [ Sudoku X Solver ] [ Jigsaw Solver ] [ Killer Solver ] [ Colour Solver ] [ KenKen Solver ] Looking for puzzles for your local newspaper? SudokuWiki. python numpy python3 backtracking jigsaw-solver forward-checking jigsaw-sudoku sudoko Updated Nov 6, 2019; Python; annasshaikh / Sudoku Star 1. Like regular Sudoku puzzles, you have to complete the grid. Wikipedia entry on Killer Sudoku; Killer. Numbers on each diagonal line cannot be repetitive. Sudoku Helper. You have to find where the mines are. Part of the popular "Sudoku Puzzle Books" series, the book is designed to help keep your brain cognitively fit, flexible, and young. All pairs of touching squares which contain consecutive values (such as 2 & 3 or 6 & 7) are marked with a white circle: o. The goal of Sudoku is to fill a 9×9 grid with numbers so that each row, column and 3×3 section contain all of the digits between 1 and 9. com, Blockudoku, Jigsaw Puzzles, Art Puzzle, Number Match and others. 'digit-single'; originally called Number Place) is a logic-based, combinatorial number-placement puzzle. Discover the joy of solving Sudoku Variations, from well-known types like Killer sudoku and Diagonal sudoku to exciting options like Tight Fit Sudoku. ซูโดกุเอกซ์ (Sudoku X) เป็นตารางซูโดกุที่คล้ายกับกติกาแบบปกติทุกอย่างแล้ว นอกจากจะเติมเลขให้แนวตั้ง แนวนอน. Need a little help? The hints page shows a logical order to solve the puzzle. The original design and puzzle format was also created by Jai. 99 (9 used & new offers)Get started with Jigsaw Sudoku. It is the complete Sudoku package, including hints, guides, easy printing and many puzzle generation options. It's easy to learn Sudoku. There are different genres of puzzles, such as crossword puzzles, word-search puzzles, number. org is a relatively well-visited web project, safe. These puzzles come in a number of different styles as well, each with slightly varying rules. Sudoku (/ s uː ˈ d oʊ k uː,-ˈ d ɒ k-, s ə-/; Japanese: 数独, romanized: sūdoku, lit. Click on Take Step to step through the solution. 99 3 Used from $17. Maintain & track your daily streaks. 4 star. It will then look at all those in turn and follow every inference, ON, OFF, ON, OFF until it can go no further. Advertisement. b) A sudoku is valid if it satisfies all the following properties:Chaining strategies now take a new leap with Alternating Inference Chains. More Buying Choices $6. Includes Crossword, Quick Cross, & Sudoku. Click the grid to download a printable version of the puzzle. The principle behind BUG is the observation that any Sudoku where all remaining cells contain just two candidates is fatally flawed. This keeps the puzzles sharp and helps me improve them. Jigsaw Consecutive Sudoku Settings. There would have been a last remaining cell with three candidates. X-Wing example 1 : Load Example or : From the Start. There will always be 9 squares, but they could be any shape. Samurai Sudoku. Loops and sockets. A Sudoku whose regions are not (necessarily) square or rectangular is known as a Jigsaw Sudoku. Check Details. Thanks for supporting our site. We keep it simple and exciting, crafting addictive games that promise long-lasting fun and stimulation for our players. Jigsaw Sudokus are the same as normal sudoku except for the shapes of the boxes. Samurai Sudoku. com, Nonogram. SudokuWiki. All results can be found at the championship‘s website. Sudoku, called Number Place in some publications, is a type of logic puzzle involving the placement of the digits 1-9 within a 9x9 grid so that each row, column, and 3x3 section of the grid contains each one exactly once. Each sub-region must contain the numbers 1-9 once, and only once. KD_Jigsaw_IM1_8_v10. In particular, an N×N square where N is prime can only be tiled with irregular N-ominoes. Effective use of feedback and data to modify product with eye for retention and. ④ 6 puzzles per page (8. " [ 5] It was popularized in 1986 by the Japanese puzzle company Nikoli, under the name Sudoku, meaning single number. 1 Availability. 99 $ 10. Including 156 Puzzles of varying difficulty to keep you entertained for hours. Playing Jigsaw Sudoku is not just a fun way to pass the time, due to its logical elements it has. It also includes Regular and Irregular Sudoku (Jigsaw Sudoku). Sudoku blank printable grid grids per pdf paper forms puzzles bergdorfbib worksheets print blanks under canas. Khối trên bên phải thiếu số 5. Item ID. The Sudoku, Sudoku X and Jigsaw are compatible with my Step-by-Step solvers. I do hope you enjoy them as much as I have in creating them. This strategy is looking at single numbers in rows and columns. These rules are very similar to the normal Sudoku rules, but where in a normal Sudoku puzzle each region is a 3x3 square, they can be any shape in a Jigsaw Sudoku puzzle. If you are searching for puzzles or how to solve logical puzzles like Sudoku then you are in the right place. BUT, in a Jigsaw, the boxes are rather strange shapes. Spilsbury attached a map to a piece of wood and then cut out each country. Digits from 1 to 9 are placed in each empty cell. Sudoku de nível especialista. The goal of the game is to fill every square on the grid with a. This Jigsaw Sudoku can be completed directly on the web page - just enter numbers in the cells. Millions of free jigsaw puzzles created by a large community. Dates in green are puzzles you've done. This puzzle is one of the more common and more fun of the various sudoku variants. 5 star. Instead of having nine 3 X 3 square areas, these 9 areas are irregular shapes. Auf Sudokuschwer. 4. Strategy Families.