User Guide for Version 1.1

Index

  1. Sudoku Library
    1. How to load Sudokus?
    2. How to review library?
    3. How to manage Sudokus in Library?
  2. Choose a Sudoku to Play
    1. How to choose a specific Sudoku from library?
    2. How to choose random Sudoku from library?
    3. How to choose random Sudoku of a specific difficulty from library?
    4. How to choose to play a sudoku from websites?
  3. Playing Sudoku
    1. How to pencil candidates?
    2. How to mark number as solution for a cell?
    3. How to unmark a cell?
    4. How to use highlighting?
    5. How to use coloring?
    6. How to color "XY Chains"?
    7. How to color "Almost Locked Sets"?
  4. Learning Center
    1. What is this Learning Center and what is it useful for?
    2. How to add additional sites?
  5. Randomizing
    1. What is randomizing?
    2. What is randomizing useful for?

Sudoku Library

  1. How to load Sudokus?

    The game comes with a couple of huge libraries of Sudokus.

    You can add the first library either from the main menu seen under the "Play Sudoku" tab

    or from the "+" button menu under the "New" tab. This library is a starting library consisting of around 250 graded and 250 ungraded puzzles.

    Once you add the first library you get the option to add the hardest puzzles known currently. It is a list nearly 1500 puzzles that are extremely hard and might not be enjoyable to solve by hand. This option is available either from the main menu seen under the "Play Sudoku" tab or from the "+" button menu under the "New" tab as the first library.

    In addition to the libraries that are bundled with the program, you also have the ability to load puzzles from the internet using two other ways

    • Loading from a URL - Use this when there is a webpage which just lists the puzzles as simple text and is not html formatted etc.
    • Loading from Clipboard - Use this when the webpage is html formatted with puzzles like in forums.

    When loading rom URL or from clipboard, the expected format is to have a string of atleast 81 characters forming the Sudoku, one per line. The first 81 characters are assumed to be the Sudoku and the rest of the line is ignored.

    The Sudoku is expected to be using only the characters from the following characters "1234567890.". Cells not set can be either represented by "0" or by ".". Spaces are not allowed. When Sudokus are added this way, they are not checked for validity.

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  2. How to review library?

    The library of Sudokus can be reviewed using the tabs "Collection" and "New".

    "Collection" consists of all Sudokus that you have played and solved atleast once.

    "New" consists of all Sudokus that have not been played yet.

    Each of this tab then allows you to browse the sudokus by rating.

    In the "Collection" you have the additional ability to see which strategies are useful for the puzzle. You add this information when you successfully complete a Sudoku and can manage the information through these screens.

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  3. How to manage Sudokus in Library?

    When you reviewing the library you have the option of deleting any Sudoku. Just "Swipe Right" on any Sudoku to get the option to delete it.

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Choose a Sudoku to play

  1. How to choose a specific Sudoku from library?

    You can browse the library and when you find a Soduku you want to play you have two choices.

    • Press Play - This will allow you to play the Sudoku as you see it.
    • Random Press Random - This will select this Sudoku to play but will randomize it so that it doesnt look the same.

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  2. How to choose random Sudoku from library?

    From the "Play Game" tab, select "Select Sudoku to Play". This will bring up a menu of selections. Select "Play Random Sudoku" to get the option to play a random puzzle. You will get this option only after loading the base library or other Sudokus into the application.

    Playing a Random game will select a random game from the "New" tab (unplayed sudokus) by default and randomize it. You can choose to include the Sudoku's you have already played successfully by toggling the "Play Unplayed Games" selection at the bottom.

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  3. How to choose random Sudoku of a specific difficulty from library?

    From the "Play Game" tab, select "Select Sudoku to Play". This will bring up a menu of selections. Select the difficulty level and application will select a random puzzle that is unplayed and randomize it. You can choose to include the Sudoku's you have already played successfully by toggling the "Play Unplayed Games" selection at the bottom.

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  4. How to choose to play a sudoku from websites?

    If the website gives the Sudoku in the form of a string, as some nice websites do, copy the string and then select "Play Sudoku from Clipboard". This action will validate that the Sudoku is a valid sudoku with a unique solution before allowing you to play.

    If the website does not offer a string to copy to other programs, then you have the option of entering the Sudoku manually by entering each digit into the grid after selecting "Enter New Sudoku".

    If you the learning section of the application to view your sites, you also have an option while viewing the websites to press the action button to bring up a number pad to enter the puzzle as you see it on the screen.

    When you exit the field by pressing anywhere else on the web page, the string of numbers entered is copied automatically into the clipboard. You can then go to the "Play Game" tab and select "Play Sudoku from Clipboard" to play the game.

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Playing Sudoku

  1. How to pencil candidates?

    You have three ways to pencil in candidates for each cell.

    • Normal Mode Operation: When you are in the "Normal" mode, tap the number you want to mark as candidate, located at the bottom of the screen, until it turns Dark Grey. Then tap the cell you want to mark or unmark the candidate in. This method is useful when using "Pencil in Candidates" option below to fill in candidates and are removing the candidates based on logic.
    • Pencil Mode Operations: You can use a dedicated Pencil mode to enter candidates quickly into cells. This method is useful when you do not want to use "Pencil in Candidates" and want to enter candidates quickly cell by cell. To do this, first enter "Pencil" mode by clicking on the button "Select Mode" and then select "Pencil Mode". Now select an cell for which a solution has not been entered. The selected cell is highlighted. tap the numbers atthe bottom of the screen to toggle the candidate status for each number.
      Exit "Pencil" mode by tapping on the button "End Pencilling".
    • Pencil in Candidates: This is an automatic option. On selecting this, the application will fill in all candidates based on the basic constraint of Sudoku - No number can repeat in a row or column or box.

    When you select a number as a solution for a cell, the application will automatically remove any cndidates that are invalid now.

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  2. How to mark number as solution for a cell?

    Tap the number you want to mark as solution, located at the bottom of the screen, until it turns Green.

    Then tap the empty cell you want to mark as the solution. The cell will now change to the number selected. You can continue marking other cells by tapping on them if you want to set them to the same number.

    If the number is not turning green, make sure ou are not in "Pencil" mode. Tap "End Pencilling" to exit Pencil mode. If you do not see the numbers, then you are in coloring mode. Tap "End Coloring" to exit Coloring mode.

    When a number is solved (occurs 9 times in the grid) it turns purple. You cannot select the number for any more cells.

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  3. How to unmark a cell?

    To unmark a cell either undo (preferred), or tap the number you want to unmark as solution, located at the bottom of the screen, until it turns Green and tap the cell to clear the number from being the solution

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  4. How to use highlighting?

    Hilighting allows you to see individual numbers more easily. You have multiple highlighting options.

    • None: This option is the normal option and is useful when working with more than one number as candidates. Hidden pairs to XY Rings to Almost Locked Sets are easier to see without any highlighting.
    • Pencilled Candidates: This option highlights the cells which have the number selected at the bottom of the screen as a candidate. Highlighting comes up as a circle around the candidate number in the cell. This highlighting is very useful when you are looking for Hidden Singles, Pointing Pairs, Box Line Reductions, X Wings, Swordfish and Jellfyfish patterns.
    • Solved Values: This option highlights the cells which are solved using the number selected at the bottom of the screen. Selecting a different number changes the highlighting to the newly selected number. Highlighting comes up as a circle around the number. This highlighting is useful for pencilling candidates when starting a new game if you are not using "Pencil in Candidates" option to aotumatically fill candidates.
    • Both: This option is useful when learning Sudoku for the easier games.

    You can exit any of the highlighting modes by clicking on the same button again.

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  5. How to use coloring?

    Coloring is useful for techniques which are easier to spot when using multiple colors to mark the cells. To enter Coloring mode, tap on the button "Select Mode" and select "Coloring Mode". This will hide the numbers and bring up buttons to use for coloring.

    Tap any button to select the tool. The tools you have are

    • Clear Color - - This will remove the color of the cell. Tap the cell to clear the color
    • Single Colors - This will color the cell with the selected color. Tap the cell to change the color to the selection
    • Double Colors - - This tool will automatically colors the cells in alternate colors. This is useful for chains / simple coloring. Select the Cells by tapping. You can tap the same cell again to change color to the alternate color.
    • Eraser - - This tool will clear the colors from all cells.

    You can select highlighting and coloring at the same time. Use this for simple coloring etc.

    To exit coloring mode, tap the button "End Coloring". Ending the coloring mode will not clear the colors automatically. The Eraser tool will be visible after ending the coloring mode also.

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  6. How to color "XY Chains"?

    Chain Coloring is useful for XY Chain techniques including Y Wings, MultiValue X Wings (XY Rings) etc. To enter Chain Coloring mode, tap on the button "Select Mode" and select "Chains and Sets Mode". This will hide the numbers and brings up the "Eraser" button. In the screen that comes up, select the Chains tool .

    • Eraser - This tool will clear the colors from all cells.

    This tool works only with cells that have exactly two pencilled possible values. You can select any cell having two pencilled possible values as the starting cell.

    To add another step to the chain you need to select another cell that is visible to the starting cell or ending cell and has exactly two pencilled possible values, one of which is common with the visible cell.

    The chain is automatically extended to the newly selected cell as long as the previous constraints are met. If the chain ends at the same value, then that value is used to highlight pencilled values that can be removed. The highlight is done in all red to differentiate it from the regular highlight. At this point you can end this mode and go back to nuormal mode to remove the highlighted numbers.

    if you find a loop, then the colors change to green and futher selections will not do anything. To continue clear the chain and start over.

    To exit chain coloring mode, tap the button "End Coloring". Ending the coloring mode will not clear the colors automatically. The Eraser tool will be visible after ending the chain coloring mode also.

    If you had highlighting turned on for Pencilled Values, then highlighting will be suspended when you enter the Chain Coloring mode. When you exit chain coloring mode, the colors of the chain are super imposed over the regular highlights.

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  7. How to color "Almost Locked Sets"?

    "Almost Locked Sets" Coloring can be used to help when you are trying to find eliminations using "ALS-XZ" strategy. To enter Almost Locked Sets Coloring mode, tap on the button "Select Mode" and select "Chains and Sets Mode". This will hide the numbers and brings up the "Eraser" button. In the screen that comes up, select the sets tool .

    • Eraser - This tool will clear the colors from all cells.

    To use this tool successfully, you need to select two sets, both of which are "Almost Locked". To switch between the sets, select the button that appears on the screen after you select "Sets" coloring tool. You can switch between Set A and Set B as many times as you want.

    Selecting a cell will add the cell to the cell only if it can belong to that set. Otherwise nothing happens. The colors of the sets represent whether the set is a valid "Almost Locked Set".

    Set A colors are "Yellow" for invalid set, and "Brown" for valid set.

    Set B colors are "Blue" for invalid set, and "Green" for valid set.

    When two sets are selected, the application tries to find the restricted commons and values that can be removed.

    Restricted Common values are highlighted within the sets. values that can be removed are highlighted with red in cells that are applicable.

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Learning Center

  1. What is this Learning Center and what is it useful for?

    This is a very simple way to keep track of the websites you use regularly for Sudoku. Be it the sites you visit to learn more about the game, learn new strategies using tutorials, learn to solve using the help of solvers or forums.

    While it integrates a simple browser, it is not a full fledged browser, but just a quick way to go to sites without closing the application. To be used when you want to get past those tricky points of a Sudoku that is making you crazy.

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  2. How to add additional sites?

    Just click the "+" button to add additional sites. The "Type" field is used automatically to group the sites. Use it to your liking.

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Randomizing

  1. What is randomizing?

    This is a very important concept to understand. When you choose a Sudoku to play, either in this application or in magazines etc, you are playing a unqiue Sudoku, but you can convert the same sudoku into another one where the Sudoku does not look to be the same as the original, but when you play the Sudoku, the strategies needed to solve will exactly be the same.

    This process of conversion can be done using a combination of the following transformation of the Sudoku Grid.

    • Exchanging two Rows within a single Row of Boxes
    • Exchanging two Columns within a single Column of Boxes
    • Exchaning all Rows between two Rows of Boxes
    • Exchanging all Columns between two Columns of Boxes
    • Transposing the grid (converting columns to rows and vice versa)
    • Transmuting the symbols - example replacing all "2"s with "3"s and vice versa.

    You can do any number of these transformations and the game play will not change for the Sudoku as a whole.

    This property of the Sudoku is utilized in this application to allow you to play multiple times the same Sudoku without being lulled into a false sense that you already know the solution.

    One note about the library - while he library might not be free of puzzles that could be considered the same based on these transformations, effort has been put to try to minimize any such variations so as to give you, the player, the best possible experience. This is the reason why this is a collector. You can collect Sudokus that challenge your mind and play them again and again by randomizing them.

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  2. What is randomizing useful for?

    You can hone your skills on particular strategies. Play a few completely different Sudoku (Not equivalent by transformations) many many times by randomizing them so that you do not know what strategies will be needed.

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