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HTML 

              
                <!--
My first attempt at coding a game using html, css and jQuery. It's pretty random as far as games go. Just wanted to see if I could pull it off. Anyway... enjoy! :)

Image assets are part of "Danc's Miraculously Flexible Game Prototyping Tiles"

Sounds: Me :)
-->
<marquee>I seem to have lost the assets to this pen - sorry! <a href="https://codepen.io/dazulu/pen/rQQpgY" target="_top">Check out my Dinosaur Memory Game instead</a>.</marquee>
<div class="wrapper">

		  <img src="http://adrianpayne.me/game/assets/images/avatar.png" class="avatar" />
		  <div class="speech-bubble"></div>
		
		  <div class="gameBoard">
		
		    <div class="gameover">
				<h3>You scored</h3>
				<span class="final-score"></span><br/>
          <span>by @dazulu</span>
		    </div>
			
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
				
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
				
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
				
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
				
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
			<div class="gametile"></div>
		  </div>
		  <div class="sidebar">
			  <div class="stone gametile"></div>
			  <div class="stone gametile"></div>
			  <div class="stone gametile"></div>
			  <div class="stone gametile"></div>
			  <div class="stone gametile"></div>
			  <div class="stone gametile"></div>
			  <div class="stone gametile"></div>
			  <div class="stone gametile"></div>    
			  <div class="stone gametile"></div>
			  <div class="stone gametile"></div>
			  <div class="scoreBoard">
				<h2 class="fancy-text">Score</h2>
				<span class="score fancy-text"></span>
				<div class="loot">
					<ul class="lootracker">
            <li><span class="gemcount">0</span> x <img src="http://adrianpayne.me/game/assets/images/gem.png"/></li>
						<li><span class="starcount">0</span> x <img src="http://adrianpayne.me/game/assets/images/star.png"/></li>
					</ul>
				</div>
			  </div>
			  <a href="javascript:void(0)" class="button fancy-text reset">Reset board</a>
		  </div>
		</div>

		<!-- Preload Game Sounds -->
		<audio preload="auto" id="pop-1" >
		  <source src="http://adrianpayne.me/game/assets/sounds/pop1.mp3"></source>
			Your browser says no sound for you :(
		</audio>
		<audio preload="auto" id="pop-2" >
		  <source src="http://adrianpayne.me/game/assets/sounds/pop2.mp3"></source>
		</audio>
		<audio preload="auto" id="gemfind" >
      <source src="http://adrianpayne.me/game/assets/sounds/gem.mp3"></source>
		</audio>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Luckiest+Guy);

body{
  height:100%;
  overflow:hidden;
  background: radial-gradient(ellipse at center, rgba(240,249,255,1) 0%,rgba(203,235,255,1) 25%,rgba(161,219,255,1) 100%);
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f0f9ff', endColorstr='#a1dbff',GradientType=1 );
  font-family: "Luckiest Guy", sans-serif;
  letter-spacing:1px  
}

div{
  box-sizing:border-box;
}

.wrapper{
  width:520px;
  margin:80px auto;
  position:relative;
}

.gameover{
  box-sizing:border-box;
  padding:70px 0 0 0;
  width:362px;
  height:327px;
  position:absolute;
  top:0;
  left:-6px;
  background: rgba(0,0,0,0.5);
  z-index:100;
  margin-top:-35px;
  border-radius:15px;
  text-align:center;
  display:none;
  color:#fff;
}

.gameBoard{
  width:350px;
  position:relative;
  float:left;
}
.gameBoard .row{
  clear:both;
}

.sidebar{
  width:140px;
  height:285px;
  position:relative;
  float:right;
}
.scoreBoard{
  width:110px;
  height:170px;
  margin-top:-34px;
  padding:10px 10px 0;
  text-align:right;
  position:relative;
  top:21px;
  left:15px;
  border-radius:8px;
  background: rgba(0,0,0,0.8);
}

.lootracker li{
	height:40px;
}
.lootracker li img{
	height:30px;
	position:relative;
	top:8px;
}

/* Board Tiles */

.gametile{
  width:70px;
  height:91px;  
  float:left;
  margin-top:-34px;
  position:relative;
  transition: top 200ms ease;
  cursor: pointer;
}

.grass{
  background: url('http://adrianpayne.me/game/assets/images/grass.png') no-repeat; 
} 
.grass:hover{
 top:-10px; 
}

.dirt{
  background: url('http://adrianpayne.me/game/assets/images/dirt.png') no-repeat;
}

.stone{
  background: url('http://adrianpayne.me/game/assets/images/stone.png') no-repeat;
}

.water{
  background: url('http://adrianpayne.me/game/assets/images/water.png') no-repeat;
}

.air{
  background: url('http://adrianpayne.me/game/assets/images/air.png') no-repeat;
}

/* Game Elements */
.gem{
  width:46px;
  height:49px;
  position:relative;
  left:12px;
}

.star{
  width:51px;
  height:51px;
  position:relative;
  left:3px;
  top:-10px;
}

.chest{
  width:55px;
  height:68px;
  position:relative;
  left:8px;
  top:-14px;
}
.chest-closed{
  background: url('http://adrianpayne.me/game/assets/images/chest-closed.png') no-repeat 0 0;
}
.chest-open{
  background: url('http://adrianpayne.me/game/assets/images/chest-open.png') no-repeat 0 0;
}

/* Buttons */
.button{
  width:80px;
  padding: 5px 10px 5px 10px;
  display:block;  
  position:absolute;
  left:17px;
  bottom:38px;
  line-height:20px;
  font-size:18px;
  text-decoration:none;
  text-align:center;
  color:#fff;
  border-radius:8px;
  border: 2px solid PeachPuff;
  background: url('http://adrianpayne.me/game/assets/images/button.jpg') repeat;
}
.button:hover{
  color:Khaki;
  border-color: Sienna;
}
.button:active{
  font-size:16px;
  border-color: PeachPuff;
}

/* Text Styles */

h2{
  font-size:22px; 
  color:#fff;
}

h3{
  font-size:35px; 
  color:#fff;
  margin-bottom:5px;
}

.final-score{
  font-size:55px; 
  color:gold;
}


.score{
  position:absolute;
  font-size:26px;
  color:gold;
  right:10px;
}

.loot{
  position:absolute;
  font-size:22px;
  color:#fff;
  right:10px;
  top:75px;
}

/* Avatar */
.avatar{
	position:absolute;
	left:-85px;
}
.speech-bubble{
  background: url('http://adrianpayne.me/game/assets/images/speech.png') no-repeat 0 0;
  width:100px;
  height:62px;
  position:absolute;
  text-align:center;
  text-transform:uppercase;
  font-size:20px;
  line-height:56px;
  left:-180px;
  top:-30px;
  opacity:0;
}

marquee {
  padding: 10px 0;
}
!

JS 

              
                  
var score = 0;
var numTiles = 25;
var tileCounter = 0;
var chestCount = 0;
var chestChance = 5;
var gemChance = 58;
var gemPoints = 500;
var chestPoints = 1500;
var gemcount = "";
var starcount = "";
var defaultTile = "grass";
var newTile = "";
var dirt = "dirt";
var stone = "stone";
var water = "water";
var gemText = "Nice!";
var chestText = "Wow!!";
var startText = "Go!";
var endText = "Yay!";

$(document).ready(function(){

  init(defaultTile,score);

  $('.'+defaultTile).on('click',function(){
    if($(this).hasClass(defaultTile)){
	
	  //get a % value of 100 for "drop rates"
	  random = Math.floor(Math.random() * 100);
      
	  if(chestCount===1){
		getGem($(this),random);
	  }
	  else{
	    if(random <= chestChance){
		  chest($(this));
		}
		else{
		  getGem($(this),random);
		}
	  }
	  
    }
	
	if($('.off').length === 25 && $('.chest-closed').length === 0){
		$('.gameover').show();
		$('.final-score').text(score);
    speechText(endText,3000);
	}
	
  });
  
  $('.reset').on('click',function(){
	$('.chest').remove();
    $('.gameBoard .gametile').removeClass('dirt water stone off').addClass(defaultTile);
    score=0;
	  chestCount=0;
    gemcount=0;
    starcount=0;
	$('.gemcount').text(0);
	$('.starcount').text(0);
    $('.score').text(score);
	$('.final-score').text(score);
	$('.gameover').hide();
	speechText(startText,600);
  });
  
});

function init(defaultTile,score){
  $('.gameBoard .gametile').addClass(defaultTile);
  $('.score').text(score);
}

function getGem(tile){
	if(random > chestChance && random <= (gemChance + chestChance)){
	  gem(tile);
	}
	else{
	  changeTile(tile,water);
	  sndEffects(0);
	}
}
 
function gem(tile) {  
  changeTile(tile,dirt);
  speechText(gemText,250);
  sndEffects(1);  
  scoreCalc(gemPoints);
  gemcount++;
  $('.gemcount').text(gemcount); 
  $(tile).append("<img class='gem' src='http://adrianpayne.me/game/assets/images/gem.png' />");
  $(tile).find('.gem').animate({top:"-30px",opacity:"0"},700);
  setTimeout(function() {
     $('img:last-child', tile).remove();
  }, 800); 
}

function chest(tile) {  
  changeTile(tile,stone);
  $(tile).append("<div class='chest chest-closed'></div>");
  chestCount = 1;
  sndEffects(0);
  
  $(".chest").click(function(){
	$(this).unbind();
	$(this).addClass('chest-open').removeClass('chest-closed');
	$(this).append("<img class='star' src='http://adrianpayne.me/game/assets/images/star.png' />");
    $(this).find('.star').animate({top:"-40px",opacity:"0"},800);
	$('.starcount').text(1); 
	speechText(chestText,300);
	sndEffects(1);
	scoreCalc(chestPoints);
	$(this).delay(200).fadeOut("slow");
  });  
}

function changeTile(tile, type){
  $(tile).removeClass(defaultTile).addClass(type).addClass("off");
}

function sndEffects(loot) {  
  $("#pop-" + Math.ceil(Math.random() * 2))[0].play();
  if(loot){
	$("#gemfind")[0].play();  
  }
}

function speechText(text,delay){
  $('.speech-bubble').stop(true, false).animate({opacity:"1"},200);
  $('.speech-bubble').text(text);
  $('.speech-bubble').delay(delay).animate({opacity:"0"},40);
}

function scoreCalc(points) {
  score += points;
  $('.score').text(score); 
}
!
999px

Console