Mathdoku - MathDoku puzzles are highly addictive Be careful; MathDoku may look difficult at first glance but once you recognize the operation combinations and you understand the logic, toy will get hooked to these little math critters. We offer Mathdoku in 3 grid sizes, so start with the smallest and work your way up.

 
MathDoku is a math puzzle similar to Sudoku. Your goal is to correctly fill the entire square field with numbers. Fields come in varying sizes: from 3×3 to 9×9. To fill a cell, select it …. Workflowmax

For Mathdoku puzzles, you can choose which way round the numbers go. So, in the bottom left we have the clues '3 -' and '3 ÷', it doesn't matter which way round the two numbers go in the cells. (It does of course matter for the general 'Sudoku' rule that each row/column must contain each number once and only once). This is another ...Details. Stuck on a Mathdoku (a.k.a Calcudoku, KenKen®) puzzle? This app can help you get unstuck by taking you through the solution steps! - Supports 4x4, 5x5, 6x6, 7x7, 8x8 and 9x9 puzzles ...‎Mathdoku + Calcudoku is arithmetic and logic puzzle similar to Sudoku and based on rules of Kendoku ® and KenKen ® Fill the grid so that each row and column only have one of each available number (1 to N). The table is separated into groups that are calculated together. Each group's total is dis…We recommend that you install the F-Droid client and use that. Download F-Droid. Version 1.96.2 (281) suggested Added on Jun 19, 2013. This version requires Android 1.6 or newer. It is built and signed by F-Droid, and guaranteed to correspond to this source tarball . Permissions.For Mathdoku puzzles, you can choose which way round the numbers go. So, in the bottom left we have the clues '3 -' and '3 ÷', it doesn't matter which way round the two numbers go in the cells. (It does of course matter for the general 'Sudoku' rule that each row/column must contain each number once and only once). This is another ...Play free online puzzles from Daily Mail, including sudoku, crossword, and more. Challenge your brain and have fun. MathDoku provides a refreshing and intellectually stimulating take on traditional Sudoku, offering players a mathematical challenge with varying puzzle sizes and difficulties. With the added complexity of segments and operations, MathDoku is a delightful puzzle experience that rewards both logical thinking and mathematical prowess. MathDoku. Es una variante de Sudoku al que se le añaden las operaciones básicas matemáticas (suma, resta, multiplicación y división). No se puede repetir ningún número en la misma fila y columna, y los segmentos marcados con trazos más gruesos han de estar ocupados por números que formen la cifra exacta mediante la operación indicada.Mathdoku is a logic game based on Sudoku, where you have to fill in numbers and symbols to make a target number in each section. Learn the rules, play daily puzzles, and compare your score with other players on …WELCOME TO MATHDOKU. At MathDoku you can play this highly addicting logic and math puzzle game. It is available in both online and printable formats for free. Are you up for the challenge?. The games at MathDoku are is loosely similar to killer sudoku and based on the same rules of KENKEN™, an educational puzzle invented by Tetsuya Miyamoto in …Cross math game online. Our cross math puzzles for kids are a type of educational activity that combines the principles of traditional crossword puzzles with mathematical concepts. Instead of using words, these crossword maths puzzles use mathematical equations, operations, and numerical answers to fill in the grid.For Mathdoku puzzles, you can choose which way round the numbers go. So, in the bottom left we have the clues '3 -' and '3 ÷', it doesn't matter which way round the two numbers go in the cells. (It does of course matter for the general 'Sudoku' rule that each row/column must contain each number once and only once). This is another ...MathDoku is a math puzzle game that combines elements of Sudoku with mathematical operations. Players must fill the square field with numbers, ensuring each number is … How to Play MathDoku. All the same rules as standard sudoku apply, but segments are now unique to each puzzle instead of always being nonets. This spin on the game tests your arithmetic skills by adding target numbers with operators in the top left corner of each segment. Play all of your favourite games online for free, including Solitaire, Crosswords, Word Games and more! From Daily Mail. Jimmy wants to make sure you enjoy the game. He'll adapt to make it a little easier, or a little harder, depending on how you play. Try playing an online chess game against a top chess computer. You can set the level from 1 to 10, from easy to grandmaster. If you get stuck, use a hint or take back the move. When you are ready to play games with ... Every Killer Sudoku puzzle only ever has one possible solution, and it can always be reached via reasonable logical deduction. In other words, guessing is never required. Killer Sudoku puzzles on puzzlemix appear at a wide range of sizes and difficulties. Usually they are 6x6, 8x8 or 9x9. In each respective case you must place 1-6, 1-8 or 1-9 ...MathDoku is a logic based numbers puzzle with one single solution. Play puzzles from 4x4 to 8x8 sizes, with 4 operations types and new puzzles every day. Check for errors, clues and sleep mode.How to Play MathDoku. All the same rules as standard sudoku apply, but segments are now unique to each puzzle instead of always being nonets. This spin on the game tests your arithmetic skills by adding target numbers with operators …MathDoku is licensed under the GPL, and the source code is available for those who want to customize the game.The game was authored by Ben Buxton and Paul Dingemans, with contributions from Pimm Hogeling, Stephen Lee, Alexander Tesfamichael, and Anthony Paul.. Overall, MathDoku is a fun and challenging game that puts a …MathDoku players also enjoy: See More Games. See All. Crystal Collapse. Arkadium's Bubble Shooter. 10x10. Mahjongg Candy Cane. MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard!Mathdoku is a task that challenges you to fill a four by four grid with numbers from 1 to 4, such that each row and column has only one of each number. You need to use the …MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard! Play MathDoku instantly online. MathDoku is a fun and engaging Online game from Evening Standard. Play it and other games from The Evening Standard.For Mathdoku puzzles, you can choose which way round the numbers go. So, in the bottom left we have the clues '3 -' and '3 ÷', it doesn't matter which way round the two numbers go in the cells. (It does of course matter for the general 'Sudoku' rule that each row/column must contain each number once and only once). This is another ...KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard! Play MathDoku online from …Description. Welcome to MathDoku! MathDoku is a math puzzle similar to Sudoku. Your goal is to correctly fill the entire square field with numbers. Fields come in varying sizes: from 3×3 to 9×9. To fill a cell, select it (using a keyboard or mouse), then select the number. You can type the number from the keyboard or use the panel buttons.‎Mathdoku + Calcudoku is arithmetic and logic puzzle similar to Sudoku and based on rules of Kendoku ® and KenKen ® Fill the grid so that each row and column only have one of each available number (1 to N). The table is separated into groups that are calculated together. Each group's total is dis… Among free sudoku games online there are number puzzles which provide additional challenge. This brain-teaser combines rules of the classic sudoku game and Math puzzles. Not only you have to fill in the grid with numbers unique in their row and line, but also meet the condition of each segment separated by thick borders. For Mathdoku puzzles, you can choose which way round the numbers go. So, in the bottom left we have the clues '3 -' and '3 ÷', it doesn't matter which way round the two numbers go in the cells. (It does of course matter for the general 'Sudoku' rule that each row/column must contain each number once and only once). This is another ...WELCOME TO MATHDOKU. At MathDoku you can play this highly addicting logic and math puzzle game. It is available in both online and printable formats for free. Are you up for the challenge?. The games at MathDoku are is loosely similar to killer sudoku and based on the same rules of KENKEN™, an educational puzzle invented by Tetsuya Miyamoto in …How to play Mathdoku on Windows? Instruction on how to play Mathdoku on Windows 10 Windows 11 PC & Laptop. In this post, I am going to show you how to install Mathdoku on Windows PC by using Android App Player such as BlueStacks, LDPlayer, Nox, KOPlayer, .... Before you start, you will need to download the APK/XAPK installer …The cells of the generated/loaded Mathdoku grid can be entered and cleared via keyboard and/or mouse. At any time, the currently selected cell will be shown in red. Via Keyboard. Select the cell you wish to edit with the mouse (If a cell is already selected, the arrow keys can be used to navigate the grid). Entering Values:Jan 30, 2024 · Mathdoku is a mathematical and logical puzzle loosely similar to sudoku. It was invented by a Japanese mathematics teacher Tetsuya Miyamoto. The objective is to fill the grid in with the digits 1 through N (where N is the number of rows or columns in the grid) such that: Each row contains exactly one of each digit. Mathdoku Puzzles can be solved by combining the four main mathematical functions of addition, subtraction, multiplication and division. To train the brain the puzzles are offered without any instruction. There are important keys to be found but no fixed starting place and no method of progression that can be learned as a strategy.Play tons of games and quizzes at USA TODAY. With a wide variety of online web games there's something for everyone. Welcome to Puzzle Baron's Calcudokus! Whether you know them as Calcudoku, Mathdoku or KenKen TM, we've got thousands and thousands of unique puzzles here for you to solve. You can play for fun, or register a free account and compete against other players for the Calcudoku Hall of Fame ! Printable 4 by 4 difficult level MathDoku, KenKen like, math puzzles for kids. Click puzzle below for free download. Click puzzle above for free download. Our printable logic and number puzzles are based on Japanese Nikoli puzzles, such as Sudoku, Kakuro and many more. Many of our puzzles involve and stimulate math skills. Our printable logic ...MathDoku players also enjoy: See More Games. See All. Pyramid Solitaire. Block Champ. Addiction Solitaire. Daily Word Search. MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard!How to Play KenKen - A Super Simple Lesson Fully Explained. also called Kendoku, Calcudoku and Mathdoku KenKen and KenDoku are trademarked names for a style...MathDoku players also enjoy: See More Games. See All. Mahjongg Solitaire. Mahjongg Candy. Sudoku. Sweet Shuffle. MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard!Rules For Playing KenKen® The numbers you use in a KenKen puzzle depend on the size of the grid you choose. A 3 x 3 grid (3 squares across, 3 squares down) means you use the numbers 1, 2, and 3.MathDoku players also enjoy: See More Games. See All. Mahjongg Solitaire. Arkadium's Bubble Shooter. Mahjongg Candy. Block Champ. MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard!Playing with Mathematical Sudokus. We are introducing a variation of the well-known Sudoku, by including mathematical constraints which challenge you to apply your knowledge of the four operations. For each grid size, there are four different puzzles, at each of three levels of difficulty, so plenty for you to get stuck into! To introduce the ...Printable 4 by 4 easier MathDoku, KenKen like, math puzzles for kids. Click puzzle below for free download. Click puzzle above for free download. Our printable logic and number puzzles are based on Japanese Nikoli puzzles, such as Sudoku, Kakuro and many more. Many of our puzzles involve and stimulate math skills.MathDoku players also enjoy: See More Games. See All. Mahjongg Solitaire. Arkadium's Bubble Shooter. Mahjongg Candy. Block Champ. MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard!Mathdoku is a mathematical and logical puzzle loosely similar to sudoku. It was invented by a Japanese mathematics teacher Tetsuya Miyamoto. The objective is to fill the grid in with the digits 1 …MathDoku players also enjoy: See More Games. See All. Mahjongg Solitaire. Mahjongg Candy. Sudoku. Sweet Shuffle. MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard!MathDoku players also enjoy: See More Games. See All. Pyramid Solitaire. Block Champ. Addiction Solitaire. Daily Word Search. MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard!MathDoku. Es una variante de Sudoku al que se le añaden las operaciones básicas matemáticas (suma, resta, multiplicación y división). No se puede repetir ningún número en la misma fila y columna, y los segmentos marcados con trazos más gruesos han de estar ocupados por números que formen la cifra exacta mediante la operación indicada.MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard! Play MathDoku instantly online. MathDoku is a fun and engaging Online game from The Independent. Play it and other games from The Independent.‎Sudoku and puzzle fans will love Mathdoku+! Simple and challenging, this free brain teaser is unlike anything you’ve played before. Get ready to spend hours of enjoyment along your phone or tablet. With over 700 levels from 3x3 to the mind blowing 9x9, Mathdoku+ is a great game to help you sharpen…‎Sudoku and puzzle fans will love Mathdoku+! Simple and challenging, this free brain teaser is unlike anything you’ve played before. Get ready to spend hours of enjoyment along your phone or tablet. With over 700 levels from 3x3 to the mind blowing 9x9, Mathdoku+ is a great game to help you sharpen…MathDoku is a logic based numbers puzzle with one single solution. How to play? • Each row or column does not have numbers repeated. • Each dotted area (cage) digits must result in the left up total. • Possible numbers for each cell are 1 to grid size. • We recommend starting with practice level!Newdoku is also referred to Kendoku,Kenken,Newdoku,Calcudoku,and Mathdoku. Newdoku is the most popular calculation game after the success of Sudoku. It is a …KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard! Welcome to Puzzle Baron's Calcudokus! Whether you know them as Calcudoku, Mathdoku or KenKen TM, we've got thousands and thousands of unique puzzles here for you to solve. You can play for fun, or register a free account and compete against other players for the Calcudoku Hall of Fame ! MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard! Play MathDoku online from USA TODAY. MathDoku is a fun and engaging online game. Play it and other games online at games.usatoday.com. For Mathdoku puzzles, you can choose which way round the numbers go. So, in the bottom left we have the clues '3 -' and '3 ÷', it doesn't matter which way round the two numbers go in the cells. (It does of course matter for the general 'Sudoku' rule that each row/column must contain each number once and only once). This is another ...Test your number logic skills in games ranging from easy to hard! KenKen players love MathDoku, the best free online version of the popular game.Jan 30, 2024 · Mathdoku is a mathematical and logical puzzle loosely similar to sudoku. It was invented by a Japanese mathematics teacher Tetsuya Miyamoto. The objective is to fill the grid in with the digits 1 through N (where N is the number of rows or columns in the grid) such that: Each row contains exactly one of each digit. MathDoku. MathDoku, known also under the name 'KenKen', is an interesting grid game. The rules are in a way similar to the Sudoku, however, you are also required to put a bit more thought into it as it requres you do simple maths. Like in the Sudoku, you have to fill each of the columns and rows with the numbers 1 to n, where n is the length of ...Nicolas from St Charles Catholic Primary School in Ryde, Australia sent in an explanation of how to solve the first 4 by 4 Mathdoku. Take a look at Nicolas' full PDF solution and see if you can work out how to finish the Mathdoku by starting from the last picture on the first page and using the 'domino effect' that Nicolas talks about.The cells of the generated/loaded Mathdoku grid can be entered and cleared via keyboard and/or mouse. At any time, the currently selected cell will be shown in red. Via Keyboard. Select the cell you wish to edit with the mouse (If a cell is already selected, the arrow keys can be used to navigate the grid). Entering Values: Printable 4 by 4 difficult level MathDoku, KenKen like, math puzzles for kids. Click puzzle below for free download. Click puzzle above for free download. Our printable logic and number puzzles are based on Japanese Nikoli puzzles, such as Sudoku, Kakuro and many more. Many of our puzzles involve and stimulate math skills. Our printable logic ... How to Play MathDoku. All the same rules as standard sudoku apply, but segments are now unique to each puzzle instead of always being nonets. This spin on the game tests your arithmetic skills by adding target numbers with operators …Play tons of games and quizzes at USA TODAY. With a wide variety of online web games there's something for everyone.The first step with a Mathdoku puzzle is always to enter pencil marks for those cells that don't have many combinations. For example, the top-left cell with the clue '5x' is a great example. There is only way to satisfy that clue, i.e. 1x5 = 5. So we can enter 1 and 5 for the pencil marks for those two cells.#dailymentalmathactivities #mathdoku #mentalmathactivities #itstartsathome #dailyactivities #mathactivities11 super easy hands on Mental Math based Addition/...#dailymentalmathactivities #mathdoku #mentalmathactivities #itstartsathome #dailyactivities #mathactivities11 super easy hands on Mental Math based Addition/...A collection of videos used on the nrich.maths.org websiteJul 2, 2020 · Mathdoku (Same as KENKEN) is an instruction-free Puzzle for training the brain.As in Sudoku, the goal of each puzzle is to fill a grid with digits –– 1 throu... For Mathdoku puzzles, you can choose which way round the numbers go. So, in the bottom left we have the clues '3 -' and '3 ÷', it doesn't matter which way round the two numbers go in the cells. (It does of course matter for the general 'Sudoku' rule that each row/column must contain each number once and only once). This is another ...Mar 28, 2024 · The first step with a Mathdoku puzzle is always to enter pencil marks for those cells that don't have many combinations. For example, the top-left cell with the clue '5x' is a great example. There is only way to satisfy that clue, i.e. 1x5 = 5. So we can enter 1 and 5 for the pencil marks for those two cells. Jan 30, 2024 · Mathdoku is a mathematical and logical puzzle loosely similar to sudoku. It was invented by a Japanese mathematics teacher Tetsuya Miyamoto. The objective is to fill the grid in with the digits 1 through N (where N is the number of rows or columns in the grid) such that: Each row contains exactly one of each digit. 9 by 9 MathDoku Puzzles. Fill in the numbers 1 to 9 in such that each number appears only once in each row and colum. The grid is divided in so called cages with operators and target numbers. The numbers in each cages must produce the target number by using the operator of that cage. 2÷.MathDoku players also enjoy: See More Games. See All. Mahjongg Solitaire. Arkadium's Bubble Shooter. Mahjongg Candy. Block Champ. MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard!For Mathdoku puzzles, you can choose which way round the numbers go. So, in the bottom left we have the clues '3 -' and '3 ÷', it doesn't matter which way round the two numbers go in the cells. (It does of course matter for the general 'Sudoku' rule that each row/column must contain each number once and only once). This is another ...Details. Stuck on a Mathdoku (a.k.a Calcudoku, KenKen®) puzzle? This app can help you get unstuck by taking you through the solution steps! - Supports 4x4, 5x5, 6x6, 7x7, 8x8 and 9x9 puzzles ...MathDoku (also known as KenKen) is a game similar to Sudoku, but with different rules involving maths. Why one solver for both? I had made a Sudoku solver, with the rules incorporated inside the solving algorithm. When I heard of MathDoku (via F-Droid), I could not do the same because there are different rules.Jun 8, 2023 · Mathdoku is a free puzzle game available on Android developed by Verschueren Geert. The game is categorized under Puzzle games and is a perfect combination of math and puzzles. The objective of the game is to solve math-based puzzles while keeping certain rules in mind. The math for each group should be correct, a value cannot reappear in the ... NRICH - explore the home of rich mathematicsThe first step with a Mathdoku puzzle is always to enter pencil marks for those cells that don't have many combinations. For example, the top-left cell with the clue '5x' is a great example. There is only way to satisfy that clue, i.e. 1x5 = 5. So we can enter 1 and 5 for the pencil marks for those two cells.Mathdoku Demonstration. Mathematical Sudokus are a variation of the well-known Sudokus. For an introduction on how to use the mathematical clues that are offered, and possible strategies that might help you complete the puzzles, take a look at Liz and Charlie working on a Mathdoku in the video below.Mathdoku is a mathematical and logical puzzle loosely similar to sudoku. It was invented by a Japanese mathematics teacher Tetsuya Miyamoto. The objective is to fill the grid in with the digits 1 …MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard! KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard!Mathdoku (Same as KENKEN) is an instruction-free Puzzle for training the brain.As in Sudoku, the goal of each puzzle is to fill a grid with digits –– 1 throu...Play free online puzzles from Daily Mail, including sudoku, crossword, and more. Challenge your brain and have fun.MathDoku players also enjoy: See More Games. See All. Mahjongg Solitaire. Arkadium's Bubble Shooter. Mahjongg Candy. Block Champ. MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard!Mathdoku is a mathematical and logical puzzle loosely similar to sudoku. It was invented by a Japanese mathematics teacher Tetsuya Miyamoto. The objective is to fill the grid in with the digits 1 …MathDoku is a fun and engaging free online game. Play it and other Arcade Thunder_XML games! 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The first step with a Mathdoku puzzle is always to enter pencil marks for those cells that don't have many combinations. For example, the top-left cell with the clue '5x' is a great example. There is only way to satisfy that clue, i.e. 1x5 = 5. So we can enter 1 and 5 for the pencil marks for those two cells.. Pacifico

mathdoku

A simple KenKen puzzle, with answers filled in as large numbers. KenKen and KenDoku are trademarked names for a style of arithmetic and logic puzzle invented in 2004 by Japanese math teacher Tetsuya Miyamoto, [1] who intended the puzzles to be an instruction-free method of training the brain. [2] The name derives from the Japanese …Szkoła Podstawowa Eureka im. Hypatii z Aleksandrii — ćwiczenia z myśleniaLink do strony Mathdoku @NRICH: https://nrich.maths.org/2795MathDoku Descripción. A los jugadores de KenKen les encanta MathDoku, la mejor versión en línea gratuita de este popular juego. ¡Prueba tu lógica matemática en partidas con una dificultad cada vez mayor! En colaboración con Arkadium. Games y ou can f eel good about. Política de privacidad. The first step with a Mathdoku puzzle is always to enter pencil marks for those cells that don't have many combinations. For example, the top-left cell with the clue '5x' is a great example. There is only way to satisfy that clue, i.e. 1x5 = 5. So we can enter 1 and 5 for the pencil marks for those two cells. Enjoy millions of the latest Android apps, games, music, movies, TV, books, magazines & more. Anytime, anywhere, across your devices. The first step with a Mathdoku puzzle is always to enter pencil marks for those cells that don't have many combinations. For example, the top-left cell with the clue '5x' is a great example. There is only way to satisfy that clue, i.e. 1x5 = 5. So we can enter 1 and 5 for the pencil marks for those two cells. MathDoku. Learning should be fun and on Wordgames.com you can find lots of games like MathDoku that make practice a joy. Play now one our our best sudoku games! Learn the basic math operations the fun way, with the help of Wordgames.com and MathDoku, in a game that combines mathematics and the classic puzzle experience that sudoku offers.Play our daily 16×16 Giant Sudoku! Thousands more printable puzzles in the archive!Nicolas from St Charles Catholic Primary School in Ryde, Australia sent in an explanation of how to solve the first 4 by 4 Mathdoku. Take a look at Nicolas' full PDF solution and see if you can work out how to finish the Mathdoku by starting from the last picture on the first page and using the 'domino effect' that Nicolas talks about.Nicolas from St Charles Catholic Primary School in Ryde, Australia sent in an explanation of how to solve the first 4 by 4 Mathdoku. Take a look at Nicolas' full PDF solution and see if you can work out how to finish the Mathdoku by starting from the last picture on the first page and using the 'domino effect' that Nicolas talks about.MathDoku players also enjoy: See More Games. See All. Mahjongg Solitaire. Arkadium's Bubble Shooter. Mahjongg Candy. Block Champ. MathDoku Overview. KenKen players love MathDoku, the best free online version of the popular game. Test your number logic skills in games ranging from easy to hard!For Mathdoku puzzles, you can choose which way round the numbers go. So, in the bottom left we have the clues '3 -' and '3 ÷', it doesn't matter which way round the two numbers go in the cells. (It does of course matter for the general 'Sudoku' rule that each row/column must contain each number once and only once). This is another ...For Mathdoku puzzles, you can choose which way round the numbers go. So, in the bottom left we have the clues '3 -' and '3 ÷', it doesn't matter which way round the two numbers go in the cells. (It does of course matter for the general 'Sudoku' rule that each row/column must contain each number once and only once). This is another ....

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