{"id":100474,"date":"2021-09-02T17:18:44","date_gmt":"2021-09-02T11:48:44","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=100474"},"modified":"2026-06-01T12:33:49","modified_gmt":"2026-06-01T07:03:49","slug":"python-sudoku-game","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/python-sudoku-game\/","title":{"rendered":"How to Create a Sudoku Game in Python"},"content":{"rendered":"<div class='__iawmlf-post-loop-links' style='display:none;' data-iawmlf-post-links='[{&quot;id&quot;:2544,&quot;href&quot;:&quot;https:\\\/\\\/drive.google.com\\\/file\\\/d\\\/1CgZ7S16CbS1rmqKPg_BTde9eT_wXfynw\\\/view?usp=drive_link&quot;,&quot;archived_href&quot;:&quot;http:\\\/\\\/web-wp.archive.org\\\/web\\\/20260601070244\\\/https:\\\/\\\/drive.google.com\\\/file\\\/d\\\/1CgZ7S16CbS1rmqKPg_BTde9eT_wXfynw\\\/view?usp=drive_link&quot;,&quot;redirect_href&quot;:&quot;&quot;,&quot;checks&quot;:[{&quot;date&quot;:&quot;2026-06-01 08:00:20&quot;,&quot;http_code&quot;:200},{&quot;date&quot;:&quot;2026-06-05 15:43:35&quot;,&quot;http_code&quot;:200},{&quot;date&quot;:&quot;2026-06-09 03:43:06&quot;,&quot;http_code&quot;:200}],&quot;broken&quot;:false,&quot;last_checked&quot;:{&quot;date&quot;:&quot;2026-06-09 03:43:06&quot;,&quot;http_code&quot;:200},&quot;process&quot;:&quot;done&quot;}]'><\/div>\n<p>It is one of the most popular puzzle games that we have been playing since our childhood. It\u2019s a great brain game as it helps the player to improve their brain capacity. Let\u2019s start developing the popular sudoku game and learn some amazing concepts while developing the project.<\/p>\n<h3>About Sudoku Game<\/h3>\n<p>In this puzzle game, the user has to fill a 9&#215;9 grid with digits such that each row, each column and each of the 3&#215;3 subgrids that form the grid contains the digit from 1 to 9.<\/p>\n<h3>Python Sudoku Game project<\/h3>\n<p>The main objective of the project is to develop a sudoku game. You need to install pygame in order to start the project. You need to import the pygame module for this project.<\/p>\n<h3>Project Prerequisites<\/h3>\n<p>This project requires good knowledge of python and pygame.<\/p>\n<h3>Download Python Sudoku Game<\/h3>\n<p>Please download source code of python sudoku game: <a href=\"https:\/\/drive.google.com\/file\/d\/1CgZ7S16CbS1rmqKPg_BTde9eT_wXfynw\/view?usp=drive_link\"><strong>Sudoku Game in Python<\/strong><\/a><\/p>\n<h3>Project File Structure<\/h3>\n<p>Let\u2019s start developing python sudoku game:<\/p>\n<p>1. Installation of Pygame module<br \/>\n2. Initializing sudoku game window and variables<br \/>\n3. Function for highlighting selected cell<br \/>\n4. Function to draw lines for making sudoku grid<br \/>\n5. Function to fill value in the cell<br \/>\n6. Function for raising error when wrong value is entered<br \/>\n7. Function to check if the entered value is valid<br \/>\n8. Function to solve sudoku game<br \/>\n9. Function to show result<br \/>\n10. Rest code<\/p>\n<h4>1. Installation of Pygame module<\/h4>\n<p>Pygame is a cross-platform set of python modules that are specially designed for writing video games. It is necessary to install pygame before starting the project. To install pygame on your system, write the following command on your terminal window or cmd.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">pip install pygame\r\n<\/pre>\n<h4>2. Initializing sudoku game window and variables<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">import pygame\r\npygame.font.init()\r\nWindow = pygame.display.set_mode((500, 500))\r\npygame.display.set_caption(\"SUDOKU GAME by DataFlair\")\r\nx = 0\r\nz = 0\r\ndiff = 500 \/ 9\r\nvalue= 0\r\ndefaultgrid =[\r\n        [0, 0, 4, 0, 6, 0, 0, 0, 5],\r\n        [7, 8, 0, 4, 0, 0, 0, 2, 0],\r\n        [0, 0, 2, 6, 0, 1, 0, 7, 8],\r\n        [6, 1, 0, 0, 7, 5, 0, 0, 9],\r\n        [0, 0, 7, 5, 4, 0, 0, 6, 1],\r\n        [0, 0, 1, 7, 5, 0, 9, 3, 0],\r\n        [0, 7, 0, 3, 0, 0, 0, 1, 0],\r\n        [0, 4, 0, 2, 0, 6, 0, 0, 7],\r\n        [0, 2, 0, 0, 0, 7, 4, 0, 0],\r\n    ]\r\n \r\n \r\nfont = pygame.font.SysFont(\"comicsans\", 40)\r\nfont1 = pygame.font.SysFont(\"comicsans\", 20)\r\n<\/pre>\n<p><strong>Code Explanation:<\/strong><\/p>\n<p>a. Pygame.display.set_mode: set_mode is a function inside the display module. It initializes the window and sets the size of the pygame window.<br \/>\nb. pygame.display.set_caption: It displays the title mentioned in the parenthesis on the top of the window.<br \/>\nc. defaultgrid: It is a nested list that will display a default 9&#215;9 grid on the screen.<br \/>\nd. font.SysFont: It creates a font object from the system fonts.<br \/>\ne. diff : It is the size of a block.<\/p>\n<h4>3. Function for highlighting selected cell<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">def cord(pos):\r\n    global x\r\n    x = pos[0]\/\/diff\r\n    global z\r\n    z = pos[1]\/\/diff\r\n \r\ndef highlightbox():\r\n    for k in range(2):\r\n        pygame.draw.line(Window, (0, 0, 0), (x * diff-3, (z + k)*diff), (x * diff + diff + 3, (z + k)*diff), 7)\r\n        pygame.draw.line(Window, (0, 0, 0), ( (x + k)* diff, z * diff ), ((x + k) * diff, z * diff + diff), 7) \r\n<\/pre>\n<p><strong>Code Explanation:<\/strong><\/p>\n<p>a. highlightbox: This function highlights the cell selected by the user.<br \/>\nb. pygame.draw.line(): It is a function that draws a straight line.<\/p>\n<h4>4. Function to draw lines for making sudoku grid<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">def drawlines():\r\n    for i in range (9):\r\n        for j in range (9):\r\n            if defaultgrid[i][j]!= 0:\r\n                pygame.draw.rect(Window, (255, 255, 0), (i * diff, j * diff, diff + 1, diff + 1))\r\n                text1 = font.render(str(defaultgrid[i][j]), 1, (0, 0, 0))\r\n                Window.blit(text1, (i * diff + 15, j * diff + 15))         \r\n    for l in range(10):\r\n        if l % 3 == 0 :\r\n            thick = 7\r\n        else:\r\n            thick = 1\r\n        pygame.draw.line(Window, (0, 0, 0), (0, l * diff), (500, l * diff), thick)\r\n        pygame.draw.line(Window, (0, 0, 0), (l * diff, 0), (l * diff, 500), thick)<\/pre>\n<p><strong>Code Explanation:<\/strong><\/p>\n<p>a. pygame.draw.rect(): It is a function that draws a rectangle.<br \/>\nb. font.render(): It renders the font.<br \/>\nc. Window.blit(): It copies the content of one surface onto another surface.<\/p>\n<h4>5. Function to fill value in the cell<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">def fillvalue(value):\r\n    text1 = font.render(str(value), 1, (0, 0, 0))\r\n    Window.blit(text1, (x * diff + 15, z * diff + 15))   \r\n<\/pre>\n<p><strong>Code Explanation:<\/strong><\/p>\n<p>a. fillvalue(): This function fills the value entered by the user in the cell.<br \/>\nb. text1: It stores the digit entered by the user.<\/p>\n<h4>6. Function for raising error when wrong value is entered<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">def raiseerror():\r\n    text1 = font.render(\"wrong!\", 1, (0, 0, 0))\r\n    Window.blit(text1, (20, 570)) \r\ndef raiseerror1():\r\n    text1 = font.render(\"wrong ! enter a valid key for the game\", 1, (0, 0, 0))\r\n    Window.blit(text1, (20, 570)) \r\n<\/pre>\n<p><strong>Code Explanation:<\/strong><\/p>\n<p>a. raiseerror() and raiseerror1(): These functions will generate error if the wrong value is entered.<\/p>\n<h4>7. Function to check if the entered value is valid<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">def validvalue(m, k, l, value):\r\n    for it in range(9):\r\n        if m[k][it]== value:\r\n            return False\r\n        if m[it][l]== value:\r\n            return False\r\n    it = k\/\/3\r\n    jt = l\/\/3\r\n    for k in range(it * 3, it * 3 + 3):\r\n        for l in range (jt * 3, jt * 3 + 3):\r\n            if m[k][l]== value:\r\n                return False\r\n    return True\r\n<\/pre>\n<p><strong>Code Explanation:<\/strong><\/p>\n<p>a. validvalue(): This function checks whether the value entered by the user is valid or not.<br \/>\nb. range(): The sequence of numbers starting from 0 is returned by range() and increments the number every time by 1 and stops before the given number.<\/p>\n<h4>8. Function to solve sudoku game<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">def solvegame(defaultgrid, i, j):\r\n     \r\n    while defaultgrid[i][j]!= 0:\r\n        if i&lt;8:\r\n            i+= 1\r\n        elif i == 8 and j&lt;8:\r\n            i = 0\r\n            j+= 1\r\n        elif i == 8 and j == 8:\r\n            return True\r\n    pygame.event.pump()   \r\n    for it in range(1, 10):\r\n        if validvalue(defaultgrid, i, j, it)== True:\r\n            defaultgrid[i][j]= it\r\n            global x, z\r\n            x = i\r\n            z = j\r\n            Window.fill((255, 255, 255))\r\n            drawlines()\r\n            highlightbox()\r\n            pygame.display.update()\r\n            pygame.time.delay(20)\r\n            if solvegame(defaultgrid, i, j)== 1:\r\n                return True\r\n            else:\r\n                defaultgrid[i][j]= 0\r\n            Window.fill((0,0,0))\r\n         \r\n            drawlines()\r\n            highlightbox()\r\n            pygame.display.update()\r\n            pygame.time.delay(50)   \r\n    return False \r\n<\/pre>\n<p><strong>Code Explanation:<\/strong><\/p>\n<p>a. solvegame(): This function helps in solving the sudoku game.<br \/>\nb. pygame.event.pump(): This function puts every event in an event queue.<br \/>\nc. pygame.display.update(): This function helps to update a portion of the screen.<br \/>\nd. pygame.time.delay(): This function will pause for a given number of milliseconds on the basis of CPU clock.<\/p>\n<h4>9. Function to show result<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">def gameresult():\r\n    text1 = font.render(\"game finished\u201d, 1, (0, 0, 0))\r\n    Window.blit(text1, (20, 570)) \r\nflag=True  \r\nflag1 = 0\r\nflag2 = 0\r\nrs = 0\r\nerror = 0\r\n<\/pre>\n<p><strong>Code Explanation:<\/strong><\/p>\n<p>a. gameresult(): This function displays the result after completing the game.<br \/>\nb. flag: It is used for running the window.<\/p>\n<h4>10. Rest Code<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">while flag:\r\n    Window.fill((255,182,193))\r\n    for event in pygame.event.get():\r\n        if event.type == pygame.QUIT:\r\n            flag = False   \r\n        if event.type == pygame.MOUSEBUTTONDOWN:\r\n            flag1 = 1\r\n            pos = pygame.mouse.get_pos()\r\n            cord(pos)\r\n        if event.type == pygame.KEYDOWN:\r\n            if event.key == pygame.K_LEFT:\r\n                x-= 1\r\n                flag1 = 1\r\n            if event.key == pygame.K_RIGHT:\r\n                x+= 1\r\n                flag1 = 1\r\n            if event.key == pygame.K_UP:\r\n                y-= 1\r\n                flag1 = 1\r\n            if event.key == pygame.K_DOWN:\r\n                y+= 1\r\n                flag1 = 1   \r\n            if event.key == pygame.K_1:\r\n                value = 1\r\n            if event.key == pygame.K_2:\r\n                value = 2   \r\n            if event.key == pygame.K_3:\r\n                value = 3\r\n            if event.key == pygame.K_4:\r\n                value = 4\r\n            if event.key == pygame.K_5:\r\n                value = 5\r\n            if event.key == pygame.K_6:\r\n                value = 6\r\n            if event.key == pygame.K_7:\r\n                value = 7\r\n            if event.key == pygame.K_8:\r\n                value = 8\r\n            if event.key == pygame.K_9:\r\n                value = 9 \r\n            if event.key == pygame.K_RETURN:\r\n                flag2 = 1  \r\n            if event.key == pygame.K_r:\r\n                rs = 0\r\n                error = 0\r\n                flag2 = 0\r\n                defaultgrid=[\r\n                [0, 0, 0, 0, 0, 0, 0, 0, 0],\r\n                [0, 0, 0, 0, 0, 0, 0, 0, 0],\r\n                [0, 0, 0, 0, 0, 0, 0, 0, 0],\r\n                [0, 0, 0, 0, 0, 0, 0, 0, 0],\r\n                [0, 0, 0, 0, 0, 0, 0, 0, 0],\r\n                [0, 0, 0, 0, 0, 0, 0, 0, 0],\r\n                [0, 0, 0, 0, 0, 0, 0, 0, 0],\r\n                [0, 0, 0, 0, 0, 0, 0, 0, 0],\r\n                [0, 0, 0, 0, 0, 0, 0, 0, 0]\r\n                ]\r\n            if event.key == pygame.K_d:\r\n                rs = 0\r\n                error = 0\r\n                flag2 = 0\r\n                defaultgrid  =[\r\n                    [0, 0, 4, 0, 6, 0, 0, 0, 5],\r\n                    [7, 8, 0, 4, 0, 0, 0, 2, 0],\r\n                    [0, 0, 2, 6, 0, 1, 0, 7, 8],\r\n                    [6, 1, 0, 0, 7, 5, 0, 0, 9],\r\n                    [0, 0, 7, 5, 4, 0, 0, 6, 1],\r\n                    [0, 0, 1, 7, 5, 0, 9, 3, 0],\r\n                    [0, 7, 0, 3, 0, 0, 0, 1, 0],\r\n                    [0, 4, 0, 2, 0, 6, 0, 0, 7],\r\n                    [0, 2, 0, 0, 0, 7, 4, 0, 0],\r\n                ]\r\n    if flag2 == 1:\r\n        if solvegame(defaultgrid , 0, 0)== False:\r\n            error = 1\r\n        else:\r\n            rs = 1\r\n        flag2 = 0   \r\n    if value != 0:           \r\n        fillvalue(value)\r\n        if validvalue(defaultgrid , int(x), int(z), value)== True:\r\n            defaultgrid[int(x)][int(z)]= value\r\n            flag1 = 0\r\n        else:\r\n            defaultgrid[int(x)][int(z)]= 0\r\n            raiseerror1()  \r\n        value = 0   \r\n       \r\n    if error == 1:\r\n        raiseerror() \r\n    if rs == 1:\r\n        gameresult()       \r\n    drawlines() \r\n    if flag1 == 1:\r\n        highlightbox()      \r\n    pygame.display.update() \r\n   \r\npygame.quit()    \r\n\r\n<\/pre>\n<p><strong>Code Explanation:<\/strong><\/p>\n<p>a. pygame.QUIT: This function will quit the pygame window.<br \/>\nb. pygame.mouse.get_pos():It gets the position of the mouse so that the number can be entered.<br \/>\nc. pygame.KEYDOWN: It gets the number to be inserted if the keys are pressed.<br \/>\nd. pygame.K_LEFT: If the left arrow key is pressed, the position of the highlighted box will move towards left.<br \/>\ne. pygame.K_RIGHT: If the right arrow key is pressed, the position of the highlighted box will move towards right.<br \/>\nf. pygame.K_UP: If the up arrow key is pressed, the position of the highlighted box will move upwards.<br \/>\ng. pygame.K_DOWN: If the down arrow key is pressed, the position of the highlighted box will move downwards.<\/p>\n<h4>Python Sudoku Game Output<\/h4>\n<p><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/09\/python-sudoku-game-output.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-100490\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/09\/python-sudoku-game-output.png\" alt=\"python sudoku game output\" width=\"1920\" height=\"1028\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/09\/python-sudoku-game-output.png 1920w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/09\/python-sudoku-game-output-768x411.png 768w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/09\/python-sudoku-game-output-1536x822.png 1536w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/09\/python-sudoku-game-output-720x386.png 720w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/09\/python-sudoku-game-output-520x278.png 520w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/09\/python-sudoku-game-output-320x171.png 320w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\" \/><\/a><\/p>\n<h3>Summary:<\/h3>\n<p>We have successfully completed the development of Sudoku Game in Python. We learned the implementation of pygame while developing the project.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>It is one of the most popular puzzle games that we have been playing since our childhood. It\u2019s a great brain game as it helps the player to improve their brain capacity. Let\u2019s start&#46;&#46;&#46;<\/p>\n","protected":false},"author":5,"featured_media":100489,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[21754,21758,21082,22734,21757,25022],"class_list":["post-100474","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-python-game-projects","tag-python-games-for-beginners","tag-python-project","tag-python-project-for-beginners","tag-python-sudoku-game","tag-sudoku-game"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Create a Sudoku Game in Python - DataFlair<\/title>\n<meta name=\"description\" content=\"Develop the popular sudoku game in Python &amp; learn some amazing concepts while developing the project. 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