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HTML

              
                <header>
  <h1>MINESWEEPER</h1>
</header>

<div id="modal">
  <div class="modal-box">
    <p class="msg">Hello !</p><br>
    <p class="play">PLAY</p>
  </div>
</div>

<section>
  <div class="mine-head">
    <span class="flag"><i class="fa fa-flag" aria-hidden="true"></i> <span class="flagN">10</span></span>
    <span class="smile"><i class="fa fa-smile-o fa-2x" aria-hidden="true"></i></span>
    <span class="time"><span class="timeN">0</span> <i class="fa fa-clock-o" aria-hidden="true"></i></span>
  </div>
  <table class="mine-body">
    <tr>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
    </tr>
    <tr>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
    </tr>
    <tr>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
    </tr>
    <tr>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
    </tr>
    <tr>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
    </tr>
    <tr>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
    </tr>
    <tr>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
    </tr>
    <tr>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
    </tr>
    <tr>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
      <td class="box backgrounded"></td>
    </tr>
  </table>
</section>

<footer>
  <p>Created by <a href="https://remybeumier.be" target="_blank">Rémy Beumier</a></p>
</footer>
              
            
!

CSS

              
                * {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}

body {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  min-height: 100vh;
  font-family: arial;
  background: #2980b9;
  background-image: linear-gradient(to top left, #2980b9, #1abc9c);
  position: relative;
  text-align: center;
}

header {
  letter-spacing: 0.2em;
  text-align: center;
  padding: 20px 5px;
  color: whitesmoke;
}


/* modal box style */
#modal {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: fixed;
  z-index: 10;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background: rgba(0, 0, 0, 0.5);
  text-align: center;
}
.modal-box {
  padding: 30px;
  margin: auto;
  width: 240px;
  background: whitesmoke;
  border-radius: 2px;
  text-align: center;
  box-shadow: 0 0 2px 3px rgba(0,0,0,0.3);
}
.modal-box p {
  color: #2980b9;
  font-size: 24px;
  letter-spacing: 0.1em;
}
.play {
  width: 160px;
  margin: auto;
  padding: 10px;
  border: solid 1px #2980b9;
  border-radius: 2px;
  cursor: pointer;
}
.play:hover {
  color: whitesmoke;
  background: #2980b9;
}


/* table style */
section {
  width: 316px;
  height: 360px;
  background: whitesmoke;
  margin: auto;
  text-align: center;
}

/* mine head style */
.mine-head {
  display: flex;
  justify-content: space-between;
  width: 316px;
  height: 50px;
  background: whitesmoke;
  border-bottom: solid 2px #333;
  padding: 5px;
  text-align: center;
}

.flag {
  line-height: 40px;
  width: 100px;
  text-align: left;
  padding-left: 5px;
  font-size: 20px;
  color: #333;
}

.smile {
  color: #f39c12;
  margin-top: 2.5px;
  text-align: center;
}

.time {
  line-height: 40px;
  width: 100px;
  text-align: right;
  padding-right: 5px;
  font-size: 20px;
  color: #333;
}

/* mine body style */
.mine-body {
  width: 316px;
  height: 316px;
  background: whitesmoke;
  padding: 5px;
}

.box {
  width: 10%;
  height: 10%;
  cursor: pointer;
  text-align: center;
  border: solid #2980b9 1px;
  color: #333;
}

.box.backgrounded {
  background: #2980b9;
  color: transparent;
  border-color: transparent;
}

.box.backgrounded:hover {
  background: #3498db;
}

.box.flagged {
  background: #e74c3c !important;
  color: transparent;
  border-color: transparent;
}

/* fix bomb icon to take full width; to uncomment when fix found for click */
.box i {
/*   width: 100%;
  height: 100%; */
}

.hidden {
  display: none !important;
}

footer {
  text-align: center;
  padding: 20px 10px;
  color: whitesmoke;
  font-size: 14px;
}
footer a {
  color: #333;
  text-decoration: none;
}
footer a:hover {
  color: whitesmoke;
  text-decoration: underline;
}
              
            
!

JS

              
                
// find a way to flag on mobile
// add options ? bigger table and/or more bombs

var bomb = '<i class="fa fa-bomb" aria-hidden="true"></i>';
var smile = '<i class="fa fa-smile-o fa-2x" aria-hidden="true"></i>';
var frown = '<i class="fa fa-frown-o fa-2x" aria-hidden="true"></i>';

var rowIndex = 0;
var colIndex = 0;
var count = 0;
var time = 0;
var flagCount = 10;
var bombCount = 0;

var boxElts = document.getElementsByClassName("box");
var backgroundedElts = document.getElementsByClassName("backgrounded");
var modalElt = document.querySelector("#modal");
var playElt = document.querySelector(".play");
var msgElt = document.querySelector(".msg");
var mineBody = document.querySelector(".mine-body");
var flagElt = document.querySelector(".flagN");
var smileElt = document.querySelector(".smile");
var timeElt = document.querySelector(".timeN");

// start of game
playElt.addEventListener("click", startGame);
                         
function startGame() {
  // clearInterval(checkPageInterval);
  addBombs(10);
  
  // click and right click handler
  for (var i=0; i<boxElts.length; i++) {
    boxElts[i].addEventListener("click", checkBoxes);
    boxElts[i].addEventListener("contextmenu", manageFlag);
    if (boxElts[i].innerHTML !== bomb) {
      addNumbers(boxElts[i], boxElts[i].parentNode.rowIndex, boxElts[i].cellIndex);
    }
  }
  
  modalElt.classList.add("hidden");
  // run time
  timer = setInterval(function() {
    document.querySelector(".timeN").innerHTML = time++;
  }, 1000);
}

function addBombs(number) {
  for (var i=0; i<number; i++) {
    var rand = Math.floor(Math.random() * boxElts.length);
    while (boxElts[rand].innerHTML === bomb) {
      rand = Math.floor(Math.random() * boxElts.length);
    }
    boxElts[rand].innerHTML = bomb;
  }
}

function checkBoxes(e) {
  var curr = e.currentTarget;
  if (!curr.classList.contains("flagged")) {
    curr.classList.remove("backgrounded");
    // click on bomb
    if (curr.innerHTML === bomb) {
      endGame("lose");
    }
    // win click
    else if (curr.innerHTML !== bomb && backgroundedElts.length == 10) {
      endGame("win");
    }
    // click on number -> reveal this box only (prevent next else to shoot checkSides)
    else if (curr.innerHTML>0 && curr.innerHTML<9) {}
    // click on empty -> reveal this box + reveal linked area until number
    else {
      checkSides(curr, curr.parentNode.rowIndex, curr.cellIndex);
    }
  }  
}

function manageFlag(e) {
  e.preventDefault();
  var curr = e.currentTarget;
  if (!curr.classList.contains("flagged") && flagCount > 0) {
    flagCount--;
    curr.classList.add("flagged");
  }
  else if (curr.classList.contains("flagged") && flagCount >= 0) {
    flagCount++;
    curr.classList.remove("flagged");
  }
  flagElt.innerHTML = flagCount;
}

function addNumbers(curr, rowI, colI) {
  var bombCount = 0;
  // top row
  if (mineBody.rows[rowI-1]) {
    if (mineBody.rows[rowI-1].cells[colI-1] && 
        mineBody.rows[rowI-1].cells[colI-1].innerHTML === bomb) {
      bombCount++;
    }
    if (mineBody.rows[rowI-1].cells[colI] && 
        mineBody.rows[rowI-1].cells[colI].innerHTML === bomb) {
      bombCount++;
    }
    if (mineBody.rows[rowI-1].cells[colI+1] && 
        mineBody.rows[rowI-1].cells[colI+1].innerHTML === bomb) {
      bombCount++;
    }
  }
  // same row
  if (mineBody.rows[rowI]) {
    if (mineBody.rows[rowI].cells[colI-1] &&
        mineBody.rows[rowI].cells[colI-1].innerHTML === bomb) {
      bombCount++;
    }
    if (mineBody.rows[rowI].cells[colI] && 
        mineBody.rows[rowI].cells[colI].innerHTML === bomb) {
      bombCount++;
    }
    if (mineBody.rows[rowI].cells[colI+1] && 
        mineBody.rows[rowI].cells[colI+1].innerHTML === bomb) {
      bombCount++;
    }
  }
  // bottom row
  if (mineBody.rows[rowI+1]) {
    if (mineBody.rows[rowI+1].cells[colI-1] && 
        mineBody.rows[rowI+1].cells[colI-1].innerHTML === bomb) {
      bombCount++;
    }
    if (mineBody.rows[rowI+1].cells[colI] && 
        mineBody.rows[rowI+1].cells[colI].innerHTML === bomb) {
      bombCount++;
    }
    if (mineBody.rows[rowI+1].cells[colI+1] && 
        mineBody.rows[rowI+1].cells[colI+1].innerHTML === bomb) {
      bombCount++;
    }
  }
  if (bombCount>0) {curr.innerHTML = bombCount;}
}

function checkSides(curr, rowI, colI) {
  if (!curr.classList.contains("backgrounded")) {
    // top row
    if (mineBody.rows[rowI-1]) {
      checkRowCell(curr, rowI-1, colI-1);
      checkRowCell(curr, rowI-1, colI);
      checkRowCell(curr, rowI-1, colI+1);
    }
    // same row
    if (mineBody.rows[rowI]) {
      checkRowCell(curr, rowI, colI-1);
      // checkRowCell(curr, rowI, colI);
      checkRowCell(curr, rowI, colI+1);
    }
    // bottom row
    if (mineBody.rows[rowI+1]) {
      checkRowCell(curr, rowI+1, colI-1);
      checkRowCell(curr, rowI+1, colI);
      checkRowCell(curr, rowI+1, colI+1);
    }
  }
}

function checkRowCell(curr, roww, coll) {
  if (mineBody.rows[roww].cells[coll] && 
      mineBody.rows[roww].cells[coll].classList.contains("backgrounded")) {
    mineBody.rows[roww].cells[coll].classList.remove("backgrounded");
    // func callback with new row-col if box is empty
    if (mineBody.rows[roww].cells[coll].innerHTML === "") {
      checkSides(curr, mineBody.rows[roww].cells[coll].parentNode.rowIndex, mineBody.rows[roww].cells[coll].cellIndex);
    }
  }
}

function endGame(result) {
  clearInterval(timer);
  if (result === "lose") {
    for (var i=0; i<boxElts.length; i++) {boxElts[i].classList.remove("backgrounded");}
    smileElt.innerHTML = frown;
    msgElt.innerHTML = "You lose !"; 
  }
  else if (result === "win") {
    msgElt.innerHTML = "You win in " + time + " sec!";    
  }
  setTimeout(function() {
    resetGame();
  }, 1200);
}

function resetGame() {
  for (var i=0; i<boxElts.length; i++) {
    boxElts[i].classList.add("backgrounded");
    boxElts[i].classList.remove("flagged");
    boxElts[i].innerHTML = "";
  }
  modalElt.classList.remove("hidden");
  playElt.innerHTML = "REPLAY";
  smileElt.innerHTML = smile;
  time = 0;
  flagCount = 10;
  flagElt.innerHTML = flagCount;
  timeElt.innerHTML = time;
  count = 0;
}

// handle focus of the page
// function checkPageFocus() {
//   if (document.hasFocus()) {
//     modalElt.classList.remove("hidden");
//   }
//   else {
//     modalElt.classList.add("hidden");
//   }
// }
// var checkPageInterval = setInterval(checkPageFocus, 300);

              
            
!
999px

Console