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HTML

CSS

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}
body {
  background-color: #5900ff;
}
.wrapper {
  box-sizing: content-box;
  width: 26.87em;
  padding: 2.5em 3em;
  background-color: #ffffff;
  position: absolute;
  transform: translate(-50%, -50%);
  left: 50%;
  top: 50%;
  border-radius: 0.6em;
  box-shadow: 0 0.9em 2.8em rgba(86, 66, 0, 0.2);
}
.game-container {
  position: relative;
  width: 100%;
  display: grid;
  gap: 0.6em;
}
.stats-container {
  text-align: right;
  margin-bottom: 1.2em;
}
.stats-container span {
  font-weight: 600;
}
.card-container {
  position: relative;
  width: 6.25em;
  height: 6.25em;
  cursor: pointer;
}
.card-before,
.card-after {
  position: absolute;
  border-radius: 5px;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 4px solid #000000;
  transition: transform 0.7s ease-out;
  backface-visibility: hidden;
}
.card-before {
  background-color: #00fff2;
  font-size: 2.8em;
  font-weight: 600;
}
.card-after {
  background-color: #ffffff;
  transform: rotateY(180deg);
}
.card-container.flipped .card-before {
  transform: rotateY(180deg);
}
.card-container.flipped .card-after {
  transform: rotateY(0deg);
}
.controls-container {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  width: 100%;
  height: 100%;
  background-color: #a200ff;
  top: 0;
}
button {
  border: none;
  border-radius: 0.3em;
  padding: 1em 1.5em;
  cursor: pointer;
}
#stop {
  font-size: 1.1em;
  display: block;
  margin: 1.1em auto 0 auto;
  background-color: #000000;
  color: #ffffff;
}
.controls-container button {
  font-size: 1.3em;
  box-shadow: 0 0.6em 2em rgba(86, 66, 0, 0.2);
}
.hide {
  display: none;
}
#result {
  text-align: center;
}
#result h2 {
  font-size: 2.5em;
}
#result h4 {
  font-size: 1.8em;
  margin: 0.6em 0 1em 0;
}

JS

const moves = document.getElementById("moves-count");
const timeValue = document.getElementById("time");
const startButton = document.getElementById("start");
const stopButton = document.getElementById("stop");
const gameContainer = document.querySelector(".game-container");
const result = document.getElementById("result");
const controls = document.querySelector(".controls-container");
let cards;
let interval;
let firstCard = false;
let secondCard = false;

//Items array
const items = [
  { name: "bee", image: "bee.png" },
  { name: "crocodile", image: "crocodile.png" },
  { name: "macaw", image: "macaw.png" },
  { name: "gorilla", image: "gorilla.png" },
  { name: "tiger", image: "tiger.png" },
  { name: "monkey", image: "monkey.png" },
  { name: "chameleon", image: "chameleon.png" },
  { name: "piranha", image: "piranha.png" },
  { name: "anaconda", image: "anaconda.png" },
  { name: "sloth", image: "sloth.png" },
  { name: "cockatoo", image: "cockatoo.png" },
  { name: "toucan", image: "toucan.png" },
];

//Initial Time
let seconds = 0,
  minutes = 0;
//Initial moves and win count
let movesCount = 0,
  winCount = 0;

//For timer
const timeGenerator = () => {
  seconds += 1;
  //minutes logic
  if (seconds >= 60) {
    minutes += 1;
    seconds = 0;
  }
  //format time before displaying
  let secondsValue = seconds < 10 ? `0${seconds}` : seconds;
  let minutesValue = minutes < 10 ? `0${minutes}` : minutes;
  timeValue.innerHTML = `<span>Time:</span>${minutesValue}:${secondsValue}`;
};

//For calculating moves
const movesCounter = () => {
  movesCount += 1;
  moves.innerHTML = `<span>Moves:</span>${movesCount}`;
};

//Pick random objects from the items array
const generateRandom = (size = 4) => {
  //temporary array
  let tempArray = [...items];
  //initializes cardValues array
  let cardValues = [];
  //size should be double (4*4 matrix)/2 since pairs of objects would exist
  size = (size * size) / 2;
  //Random object selection
  for (let i = 0; i < size; i++) {
    const randomIndex = Math.floor(Math.random() * tempArray.length);
    cardValues.push(tempArray[randomIndex]);
    //once selected remove the object from temp array
    tempArray.splice(randomIndex, 1);
  }
  return cardValues;
};

//Cards
  cards = document.querySelectorAll(".card-container");
  cards.forEach((card) => {
    card.addEventListener("click", () => {
      //If selected card is not matched yet then only run (i.e already matched card when clicked would be ignored)
      if (!card.classList.contains("matched")) {
        //flip the cliked card
        card.classList.add("flipped");
        //if it is the firstcard (!firstCard since firstCard is initially false)
        if (!firstCard) {
          //so current card will become firstCard
          firstCard = card;
          //current cards value becomes firstCardValue
          firstCardValue = card.getAttribute("data-card-value");
        } else {
          //increment moves since user selected second card
          movesCounter();
          //secondCard and value
          secondCard = card;
          let secondCardValue = card.getAttribute("data-card-value");
          if (firstCardValue == secondCardValue) {
            //if both cards match add matched class so these cards would beignored next time
            firstCard.classList.add("matched");
            secondCard.classList.add("matched");
            //set firstCard to false since next card would be first now
            firstCard = false;
            //winCount increment as user found a correct match
            winCount += 1;
            //check if winCount ==half of cardValues
            if (winCount == Math.floor(cardValues.length / 2)) {
              result.innerHTML = `<h2>You Won</h2>
            <h4>Moves: ${movesCount}</h4>`;
              stopGame();
            }
          } else {
            //if the cards dont match
            //flip the cards back to normal
            let [tempFirst, tempSecond] = [firstCard, secondCard];
            firstCard = false;
            secondCard = false;
            let delay = setTimeout(() => {
              tempFirst.classList.remove("flipped");
              tempSecond.classList.remove("flipped");
            }, 900);
          }
        }
      }
    });
  });
};

//Start game
startButton.addEventListener("click", () => {
  movesCount = 0;
  seconds = 0;
  minutes = 0;
  //controls amd buttons visibility
  controls.classList.add("hide");
  stopButton.classList.remove("hide");
  startButton.classList.add("hide");
  //Start timer
  interval = setInterval(timeGenerator, 1000);
  //initial moves
  moves.innerHTML = `<span>Moves:</span> ${movesCount}`;
  initializer();
});

//Stop game
stopButton.addEventListener(
  "click",
  (stopGame = () => {
    controls.classList.remove("hide");
    stopButton.classList.add("hide");
    startButton.classList.remove("hide");
    clearInterval(interval);
  })
);

//Initialize values and func calls
const initializer = () => {
  result.innerText = "";
  winCount = 0;
  let cardValues = generateRandom();
  console.log(cardValues);
  matrixGenerator(cardValues);
};

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