How to program the sudoku game logic in unity3d

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I am trying to make a Sudoku game in Unity3D but I'm currently stuck on the logic behind the game. (checking if all the numbers in the same subgrid, row and column are different)

I have been able to get a script that generates the whole grid running, both for a 2x2, 2x3 and a 3x3 level. The part that I am stuck on is making the 2D Array to hold the selected values for all subgrids. I can also provide the full GenerateGrid script if it's needed, but any help apart from that would be of help.

Here is also a small sample of the GenerateGrid script - the method that defines the whole grid's size depending on the difficulty:

C#

void GetDifficulty() //Method to get the difficulty of the current game
    { 
        switch (difficulty) //Switch statement to check all of the possible game difficulties
        {
            case Difficulty.Easy: //If the current difficulty is easy
                gridSize = 4; //Sets the grid size to 4
                FindObjectOfType<AudioManager>().Play("BGM_Level_Easy"); //Finds the audio manager in the scene and plays the easy theme music
                cam.transform.position = new Vector3(-2.5f, (float)gridSize * 10, ((float)gridSize / 2 - 0.5f) * 10); //Sets the camera position based on the grid size
                break; //Exits the switch statement
            case Difficulty.Medium: //If the current difficulty is medium
                gridSize = 6; //Sets the grid size to 6
                FindObjectOfType<AudioManager>().Play("BGM_Level_Medium"); //Finds the audio manager in the scene and plays the medium theme music
                cam.transform.position = new Vector3(-1f, (float)gridSize * 10, ((float)gridSize / 2 - 0.5f) * 10); //Sets the camera position based on the grid size
                break; //Exits the switch statement
            case Difficulty.Hard: //If the current difficulty is hard
                gridSize = 9; //Sets the grid size to 9
                FindObjectOfType<AudioManager>().Play("BGM_Level_Hard"); //Finds the audio manager in the scene and plays the hard theme music
                cam.transform.position = new Vector3(2f, (float)gridSize * 10, ((float)gridSize / 2 - 0.5f) * 10); //Sets the camera position based on the grid size
                break; //Exits the switch statement
            default: //Default to medium difficulty if no difficulty is set
                gridSize = 6;
                FindObjectOfType<AudioManager>().Play("BGM_Level_Medium");
                cam.transform.position = new Vector3(-1f, (float)gridSize * 10, ((float)gridSize / 2 - 0.5f) * 10); //Sets the camera position based on the grid size
                break; //Exits the switch statement
        }      
        Debug.Log(difficulty); //Logs the difficulty to ensure that the correct values have been set

(Note: I have tried my best to research as much as I can about this, but none of the stuff I found online was about a Unity3D version of the game, only 2D ones)

Thanks!

What I have tried:

I have tried making the code manually compare each tile in the subgrid to each other tile, but it didn't work - only printed that it did. (apart from being really unoptimized)

Posted 5-Dec-21 9:17am

Denis Hristov

Updated 6-Dec-21 19:21pm

v2

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BillWoodruff 5-Dec-21 21:14pm

What makes your game 3d ? What does the player see that a 2d flat grid doesn't show ?

Denis Hristov 5-Dec-21 22:00pm

Hello! That is a wonderful question. The reason why my game is set in a 3D environment and not a 2D one is because I'm making the numbers into various 3D images (of cartoon fish to be specific - it is going to be a kids game) and I need it to be 3D to be able to edit their look and positioning on the grid.

BillWoodruff 5-Dec-21 23:58pm

Glad you found my response relevant.

"making the 2D Array to hold the selected values for all subgrids."

please clarify what "selected" means here: this refers to cells the user has selected, or cells containing user entered values ... or ?

"I have been able to get a script that generates the whole grid"

what structure is returned by the script ? an array ?

Denis Hristov 6-Dec-21 0:13am

First, the GenerateGrid script is supposed to generate random values and not previously inputted ones. So, if one subgrid already generated specific values (lets say 1, 7 and 9), I'll need to let the code know whenever I put another value in and to REMEMBER it - hence the 2D Array. So if I put a 3 inside, that 2D Array would check if the specific subgrid, column and row have the specific number repeating and if one or more of them do - it will inform the user and highlight the error. If they don't, the number will simply be put in.

Also, the script only generates the grids for each level type (Easy - 4x4, Medium - 6x6 and Hard - 9x9), then stores the subrid sizes (Easy - 2x2, Medium - 2x3 and Hard - 3x3). I can provide the whole script if you want to take a look at it for yourself. That wouldn't be a problem for me.

Lastly, I do apologize for not being as clear as I should on these things. I am new to coding as you can see and with that come many things that I am still yet to learn about.

Thank you once again for replying and have a wonderful rest of your day!

BillWoodruff 6-Dec-21 0:40am

I'm having difficulty visualizing what the different size grids are. Let's take the typical 3x3 sub-grid case where each sub-grid is 3x3 cells ... 9 rows, 9 columns, 81 cells.

I assume your script will "seed" the grid with valid initial values ... right ?

Then, the user will input a value in a cell, and you wish to check if that value is valid for the row and column where the value is entered ... right ?

One obvious strategy is to define the data structure for the grid, then pass it by reference to the code that seeds it with initial values ... does that seem relevant ?

"3d ness" ? Are only the contents of the cells 3d elements ? I am not familiar with Unity 3d, so don't know what data structures are available.

Denis Hristov 6-Dec-21 0:43am

Yes, I want the script to do just that - check the colum, row and subgrid that the selected tile is sitting on. The only issue is that I don't know how to implement that in a 2D Array. Would you like to take a look at the GenerateTile script, just to see if we're both on the same page here?

P.S. I will probably reply in a couple of hours, going to bed for the night.

BillWoodruff 6-Dec-21 0:50am

Sleep well, GMT+7 here :)

Are you using WinForms, or WPF ?

I do know you can use Unity 3d in WinForms, although I have never tried that:

https://docs.unity3d.com/Manual/UnityasaLibrary-Windows.html

Denis Hristov 6-Dec-21 12:41pm

Hey! Hope you slept well. Are these plugins used to fill in code for you for specific functions? That's what I understood from it, at least. Also, I didn't understand whether or not you'd like to see the GenerateGrid script.

BillWoodruff 6-Dec-21 18:16pm

Hi, I don't want to see your script code ... I do want to see if I can help you to "pin down/define" what you want in a way that you can get more specific feedback :)

Please revise your original post to include;

The context in which you plan to use Unity ... in WPF, or, WinForms ? other ? What language is your script written in and what is its execution context ... in Unity ?

Describe the structure of your grid; show your code method that defined the Grid,

Denis Hristov 6-Dec-21 22:28pm

I have added the requested things, except the WPF/WinForms one - no clue what that is as I am new to Unity in general. I have also commented pretty much everything in the GenerateGrid script, so I hope it could make it clearer to understand my intentions.

[no name] 6-Dec-21 0:37am

If the 2D "logic" is the same as the 3D logic, and you are aware of 2D versions that work, I see no reason to not implement the 2D "working" version, and add the "3D view" later. Even if another "Z dimension" layer sits on top of the 2D kernel.

Denis Hristov 6-Dec-21 0:40am

See, I thought that it would be the same too. But then I tried it, numerous times. I tried YouTube tutorials, GitHub repositories, even stuff from forums I was able to find scattered around. But it would seem like the 3D project really interferes with the ability of the 2D logic to function correctly. (Let alone all of the extra stuff that I need to either take out or add in for every project, just for it to not be as bloated)

[no name] 6-Dec-21 11:52am

The 3D view can't "interfere" because it is "driven" (at least partially) by the 2D logic; and not the other way around. A 2D and 3D view both have x and y, and any number of functions, in common. Separation of concerns. The idea that one can't start from a 2D version, and has to go from scratch, is stretching it.

Denis Hristov 6-Dec-21 12:47pm

Hey, Gerry! So what you are saying is to basically try and edit the code of a 2D logic for the game if I happen to stumble upon it on the internet? I seriously don't know how to code such a big task myself, so that's why I'm relying on sites like this, as well as YouTube haha.

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How to program the sudoku game logic in unity3d

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