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HTML

              
                <!DOCTYPE html>
<html lang="tr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Animals</title>
    <script src="javascript.js"></script>
    <link rel="stylesheet" href="style.css">
    <link href="https://fonts.googleapis.com/css?family=Roboto:400,700&amp;subset=latin-ext" rel="stylesheet">
</head>
<body>
    <div class="cards-container">
        <div class="left-side">
            <div class="box">
                <span class="text">Zaman</span>
                <div class="time">
                    &nbsp;
                </div>
            </div>
            <div class="box">
                <span class="text">Level</span>
                <div class="level">
                    1/4
                </div>
            </div>
            <div class="box">
                <span class="text">Puan</span>
                <div class="score">
                    0
                </div>
            </div>
        </div>
        <div class="right-side">
            <div class="flex-cards">

            </div>
        </div>
    </div>
</body>
</html>
              
            
!

CSS

              
                * {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body {
    font-family: Roboto;
}

img {
    max-width: 100%;
    max-height: 100%
}

.cards-container {
    padding: 0 15px;
    width: 1140px;
    margin: auto;
    max-width: 100%;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}

.cards-container .flex-cards {
    margin: 0 -15px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    perspective: 1000px;
}

.cards-container .card {
    width: calc(25% - 30px);
    height: 200px;
    margin: 15px;
    position: relative;
    cursor: pointer;
    border-radius: 9px;
    overflow: hidden;
    box-shadow: 3px 3px 5px rgba(0,0,0,.1);
    transform-style: preserve-3d;
    transition: all .5s
}

.cards-container .card .front, .cards-container .card .back {
    background: #F44336;
    position: absolute;
    padding: 20px;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
}

.cards-container .card .back {
    transform: rotateY(180deg);
}

.cards-container .card .point {
    color: #FFF;
    position: absolute;
    left: 50%;
    top: 50%;
    backface-visibility: inherit;
    transform: rotateY(180deg) translate(-50%, -50%);
    font-size: 36px;
    transform-origin: left;
    opacity: 1;
    transition: all 300ms;
}

.cards-container .card.matched .point {
    opacity: 0;
    transition: all 300ms;
    transition-delay: 1500ms;
}

.cards-container .card.clicked, .cards-container .card.matched {
    pointer-events: none;
    transform: rotateY(180deg);
}

.cards-container .card.clicked .back {
    backface-visibility: inherit;
}

.left-side {
    width: 20%;
    padding: 0 15px
}

.left-side .box {
    box-shadow: 0 2px 8px 0px rgba(0,0,0,.2);
    padding: 15px;
    margin-bottom: 30px;
}

.left-side .box .text {
    font-weight: 700;
    text-transform: uppercase;
    display: block;
}

.left-side .box div {
    padding: 5px 10px;
    font-size: 23px
}

.left-side .box:first-child div {
    background: linear-gradient(#ffffff, #ffdf81)
}

.left-side .box:nth-child(2) div {
    background: linear-gradient(#ffffff, #9ef4ff)
}

.left-side .box:nth-child(3) div {
    background: linear-gradient(#ffffff, #f5ff91)
}

.left-side .box:last-child {
    margin-bottom: 0
}

.right-side {
    width: 80%;
    padding: 0 15px;
    position: relative;
}

.game-over, .game-win {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.game-over .message, .game-win .message {
    font-size: 40px;
    color: #FFF;
    text-transform: uppercase;
    margin-bottom: 20px;
    text-align: center;
    text-shadow: 0 2px 3px rgba(0, 0, 0, 0.4);
}

.game-over button, .game-win button {
    padding: 15px 55px;
    text-transform: uppercase;
    background: linear-gradient(magenta, purple);
    border: 3px solid #FFF;
    box-shadow: 0px 2px 5px 2px rgba(0, 0, 0, 0.3);
    font-size: 22px;
    color: #FFF;
    cursor: pointer;
    outline: none;
    border-radius: 5px;
}

@keyframes fadeInUp{
    0% {
        opacity:0;
        transform:translate3d(0,100%,0)
    }
    to {
        opacity:1;
        transform:none
    }
}
              
            
!

JS

              
                //timer
//level
//score
//sound click
var url = 'http://fkonyali.com/animals/',
    cardsC = document.getElementsByClassName('flex-cards'),
    card = document.getElementsByClassName('card'),
    cardClick = document.getElementsByClassName('clicked'),
    cardMatch = document.getElementsByClassName('matched'),
    score = document.getElementsByClassName('score'),
    level = document.getElementsByClassName('level'),
    wi_level = 1,
    right_side = document.getElementsByClassName('right-side'),
    level1cards = ['dog', 'cat', 'bear', 'elephant', 'dog', 'cat', 'bear', 'elephant'],
    level2cards = ['owl', 'lion', 'monkey', 'fish', 'chicken', 'rabbit', 'owl', 'lion', 'monkey', 'fish', 'chicken', 'rabbit'],
    level3cards = ['panda', 'tiger', 'unicorn', 'zebra', 'bat', 'giraffe', 'animal', 'chameleon','panda', 'tiger', 'unicorn', 'zebra', 'bat', 'giraffe', 'animal', 'chameleon'],
    level4cards = ['cheetah', 'crocodile', 'fox', 'goat', 'koala', 'narwhal', 'otter', 'sheep', 'dog', 'panda', 'cheetah', 'crocodile', 'fox', 'goat', 'koala', 'narwhal', 'otter', 'sheep', 'dog', 'panda'];

function shuffle(array) {
    var currentIndex = array.length,
        temporaryValue,
        randomIndex;

    while(0 != currentIndex) {
        randomIndex = Math.floor(Math.random() * currentIndex);
        currentIndex -= 1;

        temporaryValue = array[currentIndex];
        array[currentIndex] = array[randomIndex];
        array[randomIndex] = temporaryValue;
    }
    return array;
}

var level1cards_mix = shuffle(level1cards),
    level2cards_mix = shuffle(level2cards),
    level3cards_mix = shuffle(level3cards),
    level4cards_mix = shuffle(level4cards);

function innerItems(x,y,z) {
    for(i=0; i<y.length; i++) {
        x[0].innerHTML += 
            "<div class='card' data-img='"+btoa(z[i])+"'>"+
                "<div class='front'>"+
                    
                "</div>"+
                "<div class='back'>"+
                    
                "</div>"+
                "<div class='point'>"+

                "</div>"+
            "</div>";
    }
    innerItems_click(y);
}

function innerItems_click(y) {
    for(a=0; a<y.length; a++) {
        card[a].addEventListener("click", click_cards);
    }
}

var hasClickCard = false,
    clickable = false,
    firstCard, secondCard, point=0, totalPoint=0;

function click_cards(e) {
    var attr = atob(this.getAttribute("data-img"));
    if(clickable) return;
    this.classList.add('clicked');
    this.getElementsByClassName('back')[0].innerHTML = "<img src='"+url+attr+".svg' alt='"+attr+"' />";
    if(!hasClickCard) {
        //first click
        hasClickCard = true;
        firstCard = this;
        firstCardAttr = firstCard.getAttribute('data-img');
    }else {
        //second click
        hasClickCard = false;
        secondCard = this;
        secondCardAttr = secondCard.getAttribute('data-img');
        checkForMatch();
    }
}

var timer_circle;

function startTimer(duration, display) {
    var timer = duration, minutes, seconds;
    timer_circle = setInterval(function () {
        minutes = parseInt(timer / 60, 10)
        seconds = parseInt(timer % 60, 10);
        minutes = minutes < 10 ? "0" + minutes : minutes;
        seconds = seconds < 10 ? "0" + seconds : seconds;

        display.textContent = minutes + ":" + seconds;

        //if timer zero is game over
        if(timer == 0) {
            clearInterval(timer_circle);
            right_side[0].innerHTML += "<div class='game-over'>"+
                                            "<div class='message'>Kaybettin!</div>"+ 
                                            "<button id='play-again'>Tekrar Oyna</button>"+
                                        "</div>"
            var playAgain_btn = document.getElementById('play-again');
            playAgain_btn.addEventListener('click', play_again);
        }else {
            if (--timer < 0) {
                timer = duration;
            }
        }
    }, 1000);
}

function checkForMatch() {
    var lastMatch_Cards = cardMatch.length;
    console.log(lastMatch_Cards);
    //if match
    if(firstCardAttr === secondCardAttr) {
        disabledCards();
        firstCard.classList.add('matched');
        secondCard.classList.add('matched');
        //point
        point +=100;
        totalPoint +=point * 2;
        score[0].innerHTML = totalPoint;
        firstCard.getElementsByClassName('point')[0].innerHTML = "+"+point;
        secondCard.getElementsByClassName('point')[0].innerHTML = "+"+point;
        if(wi_level == 1 && lastMatch_Cards == 6) {
            //game-win
            clearInterval(timer_circle);
            right_side[0].innerHTML += "<div class='game-win'>"+
                                            "<div class='message'>Kazandın!</div>"+ 
                                            "<button id='second-level'>Sonraki Seviye</button>"+
                                        "</div>"
            var secondLevel_btn = document.getElementById('second-level');
                secondLevel_btn.addEventListener('click', secondLevel);
        }else if(wi_level == 2 && lastMatch_Cards == 10) {
            //game-win
            clearInterval(timer_circle);
            right_side[0].innerHTML += "<div class='game-win'>"+
                                            "<div class='message'>Kazandın!</div>"+ 
                                            "<button id='third-level'>Sonraki Seviye</button>"+
                                        "</div>"
            var thirdLevel_btn = document.getElementById('third-level');
                thirdLevel_btn.addEventListener('click', thirdLevel);
        }else if(wi_level == 3 && lastMatch_Cards == 14) {
            //game-win
            clearInterval(timer_circle);
            right_side[0].innerHTML += "<div class='game-win'>"+
                                            "<div class='message'>Kazandın!</div>"+ 
                                            "<button id='fourth-level'>Sonraki Seviye</button>"+
                                        "</div>"
            var fourthLevel_btn = document.getElementById('fourth-level');
                fourthLevel_btn.addEventListener('click', fourthLevel);
        }else if(wi_level == 4 && lastMatch_Cards == 18){
            //game-win
            clearInterval(timer_circle);
            right_side[0].innerHTML += "<div class='game-win'>"+
                                            "<div class='message'>Oyun bitti. Kazandın!</div>"+ 
                                            "<button id='play-again'>Tekrar Baştan Oyna</button>"+
                                        "</div>";
            wi_level = 1;
            var playAgain_btn = document.getElementById('play-again');
                playAgain_btn.addEventListener('click', play_again);
        }
    }else {
        unClickCards();
        //point
        point = 0;
    }
}

function secondLevel() {
    wi_level = 2;
    point = 0;
    right_side[0].innerHTML = "";
    level[0].innerHTML = "2/4";
    var level2cards_minutes = 85,
        display = document.querySelector('.time');
    startTimer(level2cards_minutes, display);
    right_side[0].innerHTML = "<div class='flex-cards'></div>";
    innerItems(cardsC,level2cards,level2cards_mix);
}

function thirdLevel() {
    wi_level = 3;
    point = 0;
    right_side[0].innerHTML = "";
    level[0].innerHTML = "3/4";
    var level3cards_minutes = 150,
        display = document.querySelector('.time');
    startTimer(level3cards_minutes, display);
    right_side[0].innerHTML = "<div class='flex-cards'></div>";
    innerItems(cardsC,level3cards,level3cards_mix);
}

function fourthLevel() {
    wi_level = 4;
    point = 0;
    right_side[0].innerHTML = "";
    level[0].innerHTML = "4/4";
    var level4cards_minutes = 210,
        display = document.querySelector('.time');
    startTimer(level4cards_minutes, display);
    right_side[0].innerHTML = "<div class='flex-cards'></div>";
    innerItems(cardsC,level4cards,level4cards_mix);
}

console.log(wi_level);

function disabledCards() {
    //is match
    firstCard.removeEventListener('click', click_cards);
    secondCard.removeEventListener('click', click_cards);
}

function unClickCards() {
    clickable = true;

    setTimeout(function(){
        firstCard.classList.remove('clicked');
        secondCard.classList.remove('clicked');
        clickable = false;
    },1500);
}

function play_again() {
    var display = document.querySelector('.time');
    point = 0;
    level[0].innerHTML = "1/4";
    score[0].innerHTML = "0";
    if(wi_level == 1) {
        var level1cards_minutes = 38;
        startTimer(level1cards_minutes, display);
        right_side[0].innerHTML = "<div class='flex-cards'></div>";
        innerItems(cardsC,level1cards,level1cards_mix);
    }else if(wi_level == 2) {
        var level2cards_minutes = 85;
        startTimer(level2cards_minutes, display);
        right_side[0].innerHTML = "<div class='flex-cards'></div>";
        innerItems(cardsC,level2cards,level2cards_mix);
    }else if(wi_level == 3) {
        var level3cards_minutes = 150;
        startTimer(level3cards_minutes, display);
        right_side[0].innerHTML = "<div class='flex-cards'></div>";
        innerItems(cardsC,level3cards,level3cards_mix);
    }else {
        var level4cards_minutes = 210;
        startTimer(level4cards_minutes, display);
        right_side[0].innerHTML = "<div class='flex-cards'></div>";
        innerItems(cardsC,level4cards,level4cards_mix);
    }
}

window.onload = function() {
    innerItems(cardsC,level1cards,level1cards_mix);
    var level1cards_minutes = 38,
        display = document.querySelector('.time');
    startTimer(level1cards_minutes, display);
}
              
            
!
999px

Console