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HTML

              
                <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Javascript Snake Game</title>
</head>
<body>
    <div class="body">
        <div class="score-box">
            <div id="scoreBox">Score: 0</div>
            <div id="hiscoreBox">High: 0</div>
        </div>
        <div id="board"></div>
    </div>
</body>
<script src="js/index.js"></script>
</html>
              
            
!

CSS

              
                *{
    padding: 0;
    margin: 0;
}

.body{
    background: #b0b901; 
    min-height: 100vh;
    background-size: 100vw 100vh;
    background-repeat: no-repeat;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.score-box{
    display: grid;
    grid-template-columns: auto auto;
    width: 100%;
}

#scoreBox{
    font-size: 25px;
    margin: 10px 25px;
    font-weight: bold;
    font-family: Arial, Helvetica, sans-serif;
    justify-self: start;
}

#hiscoreBox{
    font-size: 25px;
    margin: 10px 25px;

    font-weight: bold;
    font-family: Arial, Helvetica, sans-serif;
    justify-self:end

}

#board{
    background: #bac404; 
    width: 90vmin;
    height: 92vmin;
    border: 8px dashed black;
    display: grid;
    grid-template-rows: repeat(18, 1fr);
    grid-template-columns: repeat(18, 1fr);
}

.head{
    
    width: 30px;
    height: 30px;
}

.snake{
    width: 30px;
    height: 30px;
    border-radius: 20px;

}

.food{
    width: 30px;
    height: 30px;  
}
              
            
!

JS

              
                // Game Constants & Variables
let inputDir = {x: 0, y: 0}; 
const foodSound = new Audio('https://vidyasheela.com/web-contents/website-components/Javascript-Projects/javascript-snake-game/eat.mp3');
const gameOverSound = new Audio('https://vidyasheela.com/web-contents/website-components/Javascript-Projects/javascript-snake-game/gameover.mp3');
const moveSound = new Audio('https://vidyasheela.com/web-contents/website-components/Javascript-Projects/javascript-snake-game/move.mp3');
const musicSound = new Audio('https://vidyasheela.com/web-contents/website-components/Javascript-Projects/javascript-snake-game/bg-music.mp3');
let speed = 12;
let score = 0;
let lastPaintTime = 0;
let snakeArr = [
    {x: Math.ceil(Math.random()*10), y: Math.ceil(Math.random()*10)}
];

food = {x: Math.ceil(Math.random()*10), y: Math.ceil(Math.random()*10)};

// Game Functions
function main(ctime) {
    window.requestAnimationFrame(main);
    // console.log(ctime)
    if((ctime - lastPaintTime)/1000 < 1/speed){
        return;
    }
    lastPaintTime = ctime;
    gameEngine();
}

function isCollide(snake) {
    // If you bump into yourself 
    for (let i = 1; i < snakeArr.length; i++) {
        if(snake[i].x === snake[0].x && snake[i].y === snake[0].y){
            return true;
        }
    }
    // If you bump into the wall
    if(snake[0].x >= 18 || snake[0].x <=0 || snake[0].y >= 18 || snake[0].y <=0){
        return true;
    }
        
    return false;
}

function gameEngine(){
    // Part 1: Updating the snake array & Food
    if(isCollide(snakeArr)){
        gameOverSound.play();
        musicSound.pause();
        inputDir =  {x: 0, y: 0}; 
        alert("Game Over. Press any key to play again!");
        snakeArr = [{x: 13, y: 15}];
        musicSound.play();
        score = 0; 
    }

    // If you have eaten the food, increment the score and regenerate the food
    if(snakeArr[0].y === food.y && snakeArr[0].x ===food.x){
        foodSound.play();
        score += 1;
        if(score>hiscoreval){
            hiscoreval = score;
            localStorage.setItem("hiscore", JSON.stringify(hiscoreval));
            hiscoreBox.innerHTML = "High: " + hiscoreval;
        }
        scoreBox.innerHTML = "Score: " + score;
        snakeArr.unshift({x: snakeArr[0].x + inputDir.x, y: snakeArr[0].y + inputDir.y});
        let a = 2;
        let b = 16;
        food = {x: Math.round(a + (b-a)* Math.random()), y: Math.round(a + (b-a)* Math.random())}
    }

    // Moving the snake
    for (let i = snakeArr.length - 2; i>=0; i--) { 
        snakeArr[i+1] = {...snakeArr[i]};
    }

    snakeArr[0].x += inputDir.x;
    snakeArr[0].y += inputDir.y;

    // Part 2: Display the snake and Food
    // Display the snake
    board.innerHTML = "";
    snakeArr.forEach((e, index)=>{
        snakeElement = document.createElement('img');
        snakeElement.style.gridRowStart = e.y;
        snakeElement.style.gridColumnStart = e.x;

        if(index === 0){
            snakeElement.src= "https://vidyasheela.com/web-contents/website-components/Javascript-Projects/javascript-snake-game/snake-head.png"
            snakeElement.classList.add('head');
        }
        else{
            snakeElement.src= "https://vidyasheela.com/web-contents/website-components/Javascript-Projects/javascript-snake-game/snake-body.png"

            snakeElement.classList.add('snake');
        }
        board.appendChild(snakeElement);
    });
    // Display the food
    foodElement = document.createElement('img');
    foodElement.style.gridRowStart = food.y;
    foodElement.style.gridColumnStart = food.x;
    foodElement.src = "https://vidyasheela.com/web-contents/website-components/Javascript-Projects/javascript-snake-game/mouse.png"
    foodElement.classList.add('food')
    board.appendChild(foodElement);


}


// Main logic starts here
musicSound.play();
let hiscore = localStorage.getItem("hiscore");
if(hiscore === null){
    hiscoreval = 0;
    localStorage.setItem("hiscore", JSON.stringify(hiscoreval))
}
else{
    hiscoreval = JSON.parse(hiscore);
    hiscoreBox.innerHTML = "High: " + hiscore;
}

window.requestAnimationFrame(main);
window.addEventListener('keydown', e =>{
    inputDir = {x: 0, y: 1} // Start the game
    moveSound.play();
    switch (e.key) {
        case "ArrowUp":
            console.log("ArrowUp");
            inputDir.x = 0;
            inputDir.y = -1;
            break;

        case "ArrowDown":
            console.log("ArrowDown");
            inputDir.x = 0;
            inputDir.y = 1;
            break;

        case "ArrowLeft":
            console.log("ArrowLeft");
            inputDir.x = -1;
            inputDir.y = 0;
            break;

        case "ArrowRight":
            console.log("ArrowRight");
            inputDir.x = 1;
            inputDir.y = 0;
            break;
        default:
            break;
    }

});

window.addEventListener('touchstart', handleTouchStart, false);        
window.addEventListener('touchmove', handleTouchMove, false);

var xDown = null;                                                        
var yDown = null;

function getTouches(evt) {
  return evt.touches ||             // browser API
         evt.originalEvent.touches; // jQuery
}                                                     
                                                                         
function handleTouchStart(evt) {
    const firstTouch = getTouches(evt)[0];                                      
    xDown = firstTouch.clientX;                                      
    yDown = firstTouch.clientY;                                      
};                                                
                                                                         
function handleTouchMove(evt) {
    if ( ! xDown || ! yDown ) {
        return;
    }

    var xUp = evt.touches[0].clientX;                                    
    var yUp = evt.touches[0].clientY;

    var xDiff = xDown - xUp;
    var yDiff = yDown - yUp;
                                                                         
    if ( Math.abs( xDiff ) > Math.abs( yDiff ) ) {/*most significant*/
        if ( xDiff > 0 ) {
            /* right swipe */ 
            console.log("right swipe");
            inputDir.x = -1;
            inputDir.y = 0;
        } else {
            /* left swipe */
            console.log("left swipe");
            inputDir.x = 1;
            inputDir.y = 0;
        }                       
    } else {
        if ( yDiff > 0 ) {
            /* down swipe */
            console.log("Down swipe");
            inputDir.x = 0;
            inputDir.y = -1; 
        } else { 
            /* up swipe */
            console.log("Up Swipe");
            inputDir.x = 0;
            inputDir.y = 1;
        }                                                                 
    }
    /* reset values */
    xDown = null;
    yDown = null;                                             
};
              
            
!
999px

Console