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HTML 

              
                 <body onload="generateBoard(2)">

    <div class=" max-550">
        <p>This is just a random sudoku board generator based in the difficulty introduced that i made up for my game "soduko". You can play it
            <a href="https://reymon359.github.io/ionic-soduko/" target="_blank">here</a>. And get the code   <a href="https://github.com/reymon359/web-experiments/tree/master/Sudoku%20Board%20Generator" target="_blank">here</a> Enjoy :D
        </p>
        <div style="display: inline;" id="difficultyButton">
            <button onclick="generateBoard(0)"> Beginner </button>
            <button onclick="generateBoard(1)"> Easy </button>
            <button onclick="generateBoard(2)"> Normal </button>
            <button onclick="generateBoard(3)"> Hard </button>
            <button onclick="generateBoard(4)"> Extreme </button>
        </div>
        <div class="board"><div class="row">            <div class="box">                <div class="fixed">                    <div>3</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>9</div>                </div>            </div>            <div class="box  border-right">                <div class="fixed">                    <div>7</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>8</div>                </div>            </div>            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box  border-right">                <div class="fixed">                    <div>5</div>                </div>            </div>            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>4</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>2</div>                </div>            </div>        </div><div class="row">            <div class="box">                <div class="fixed">                    <div>1</div>                </div>            </div>            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box  border-right">                <div class="fixed">                    <div>2</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>3</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>9</div>                </div>            </div>            <div class="box  border-right">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>8</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>6</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>5</div>                </div>            </div>        </div><div class="row">            <div class="box border-bottom">                <div>                    <div></div>                </div>            </div>            <div class="box border-bottom">                <div class="fixed">                    <div>6</div>                </div>            </div>            <div class="box border-right border-bottom ">                <div class="fixed">                    <div>5</div>                </div>            </div>            <div class="box border-bottom">                <div class="fixed">                    <div>1</div>                </div>            </div>            <div class="box border-bottom">                <div class="fixed">                    <div>2</div>                </div>            </div>            <div class="box border-right border-bottom ">                <div class="fixed">                    <div>4</div>                </div>            </div>            <div class="box border-bottom">                <div>                    <div></div>                </div>            </div>            <div class="box border-bottom">                <div class="fixed">                    <div>7</div>                </div>            </div>            <div class="box border-bottom">                <div>                    <div></div>                </div>            </div>        </div><div class="row">            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>1</div>                </div>            </div>            <div class="box  border-right">                <div class="fixed">                    <div>3</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>7</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>8</div>                </div>            </div>            <div class="box  border-right">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>5</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>2</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>4</div>                </div>            </div>        </div><div class="row">            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box  border-right">                <div class="fixed">                    <div>6</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>5</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>4</div>                </div>            </div>            <div class="box  border-right">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>1</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>9</div>                </div>            </div>        </div><div class="row">            <div class="box border-bottom">                <div class="fixed">                    <div>5</div>                </div>            </div>            <div class="box border-bottom">                <div>                    <div></div>                </div>            </div>            <div class="box border-right border-bottom ">                <div class="fixed">                    <div>4</div>                </div>            </div>            <div class="box border-bottom">                <div class="fixed">                    <div>9</div>                </div>            </div>            <div class="box border-bottom">                <div class="fixed">                    <div>1</div>                </div>            </div>            <div class="box border-right border-bottom ">                <div class="fixed">                    <div>3</div>                </div>            </div>            <div class="box border-bottom">                <div>                    <div></div>                </div>            </div>            <div class="box border-bottom">                <div class="fixed">                    <div>8</div>                </div>            </div>            <div class="box border-bottom">                <div>                    <div></div>                </div>            </div>        </div><div class="row">            <div class="box">                <div class="fixed">                    <div>6</div>                </div>            </div>            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box  border-right">                <div class="fixed">                    <div>1</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>4</div>                </div>            </div>            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box  border-right">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>2</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>3</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>8</div>                </div>            </div>        </div><div class="row">            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>5</div>                </div>            </div>            <div class="box  border-right">                <div class="fixed">                    <div>8</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>2</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>3</div>                </div>            </div>            <div class="box  border-right">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>7</div>                </div>            </div>        </div><div class="row">            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>3</div>                </div>            </div>            <div class="box  border-right">                <div class="fixed">                    <div>9</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>6</div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>7</div>                </div>            </div>            <div class="box  border-right">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>4</div>                </div>            </div>            <div class="box">                <div>                    <div></div>                </div>            </div>            <div class="box">                <div class="fixed">                    <div>1</div>                </div>            </div>        </div></div>
    </div>
</body><script src="https://cdn.jsdelivr.net/gh/reymon359/web-experiments/Social%20Signature/socialsignature.min.js" crossorigin="anonymous"></script>
!

CSS 

              
                *{
  font-family:Arial
}
button {
    color: #fff;
    background-color: #009688;
    font-family: Arial, Helvetica, sans-serif;
    cursor: pointer;
    padding: 3%;
    border: none;
    border-radius: 50px;
    box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.14), 0 3px 1px -2px rgba(0, 0, 0, 0.2), 0 1px 5px 0 rgba(0, 0, 0, 0.12);
}

button:hover {
    background-color: #024d45;
    color: #fff;
}

button:focus {
    outline: 0;
    background-color: #024d45;
}

.max-550 {
    max-width: 500px;
    margin: auto;
    text-align: center;
}

.board {
    position: relative;
    margin-top: 5%;
    text-align: center;
    width: 100%;
    margin: auto;
    padding-top: 3%;
}

.row {
    text-align: center;
    display: -ms-flexbox;
    display: flex;
    flex-wrap: wrap;
}

.box {
    display: inline-block;
    width: 9.5%;
    text-align: center;
    padding: .5%;
}

.fixed {
    background-color: #80cbc4;
    cursor: context-menu;
    border-radius: 25%;
    padding: 30%;
}

.border-right {
    border-right: 2px solid;
}

.border-bottom {
    border-bottom: 2px solid;
}
!

JS 

              
                /*
 * Sudoku board Generator
 * Ramon Morcillo @reymon359
 */

function generateBoard(difficulty) {
    let board = [
        [2, 8, 6, 7, 5, 4, 9, 3, 1],
        [9, 3, 1, 2, 8, 6, 7, 5, 4],
        [7, 5, 4, 9, 1, 3, 8, 6, 2],
        [8, 9, 2, 6, 7, 5, 4, 1, 3],
        [6, 7, 5, 4, 3, 1, 2, 9, 8],
        [4, 1, 3, 8, 9, 2, 6, 7, 5],
        [5, 6, 9, 3, 4, 8, 1, 2, 7],
        [3, 4, 7, 1, 2, 9, 5, 8, 6],
        [1, 2, 8, 5, 6, 7, 3, 4, 9]
    ];
    let random10 = Math.floor((Math.random() * 10) + 1);
    for (let r = 0; r < random10; r++) {
        for (let i = 0; i < 9; i++) {
            for (let j = 0; j < 9; j++) {
                board[i][j] = board[i][j] + 1;
                if (board[i][j] == 10) {
                    board[i][j] = 1;
                }
            }
        }
    }
    let min = difficulty;
    let max = min + 2;
    board.forEach((row) => {
        let toReplace = shuffleArray([0, 1, 2, 3, 4, 5, 6, 7, 8]);
        for (let i = 0; i < Math.floor(Math.random() * (max - min + 1) + min); i++) {
            row[toReplace[i]] = '';
        }
    });
    renderBoard(board);
    

}

function renderBoard(boardToRender) {
    let board = boardToRender;
    let html = '';
    for (let i = 0; i < 9; i++) {
        html += "<div class='row' >";
        for (let j = 0; j < 9; j++) {

            // if (i == 2 && j == 2) {
            //     html += "            <div class='box border-right border-bottom '  >";
            // } else if (j == 2 || j == 5) {
            //     html += "            <div class='box border-right'  >";

            if ((i == 2 && j == 2) || (i == 2 && j == 5) || (i == 5 && j == 2) || (i == 5 && j == 5)) {
                html += "            <div class='box border-right border-bottom '  >";
            } else if (i == 2 || i == 5) {
                html += "            <div class='box border-bottom'  >";
            } else if (j == 2 || j == 5) {
                html += "            <div class='box  border-right'  >";
            } else {
                html += "            <div class='box'  >";
            }

            if (board[i][j] == '') {
                html += "                <div >"
            } else {
                html += "                <div class='fixed'  >"
            }


            html += "                    <div>" + board[i][j] + "</div>"
            html += "                </div>"
            html += "            </div>"
        }
        html += "        </div>"

    }
    document.getElementsByClassName('board')[0].innerHTML = html;

}
// -------SHUFFLE ARRAY------------
function shuffleArray(array) {
    let currentIndex = array.length,
        temporaryValue, randomIndex;
    // While there remain elements to shuffle inside the array
    while (0 !== currentIndex) {
        // Pick a remaining element from the array
        randomIndex = Math.floor(Math.random() * currentIndex);
        // randomIndex is a random number between 0 and the array position
        currentIndex -= 1;
        // We get a new currentIndex and swap it with the current element.
        temporaryValue = array[currentIndex];
        // We save the currentIndex value in temporaryValue
        array[currentIndex] = array[randomIndex];
        // Now we fill the new currentIndex position with the value from the randomIndex
        array[randomIndex] = temporaryValue;
        // Lastly in the randomIndex position we put the temporaryValue we saved before
    }
    return array;
}
!
999px

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