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HTML

<!DOCTYPE html>
<html>
  <head>
    <title>TETRIS GAMES WITH JAVASCRIPT</title>
    <link rel="stylesheet" type="text/css" href="/css/tetris.css" />
  </head>
  <body>
    <div id="tetris">
      <div id="info">
        <div id="next_shape"></div>
        <p id="level">Level: <span></span></p>
        <p id="lines">Lines: <span></span></p>
        <p id="score">Score: <span></span></p>
        <p id="time">Time: <span></span></p>
        <button id="start">Start</button>
        <p class="red">Press the Esc button to pause<span></span></p>
      </div>
      <div id="canvas"></div>
    </div>
    <script type="text/javascript" src="script.js"></script>
  </body>
  <script>
    (function () {
  var isStart = false;
  var tetris = {
    board: [],
    boardDiv: null,
    canvas: null,
    pSize: 20,
    canvasHeight: 440,
    canvasWidth: 200,
    boardHeight: 0,
    boardWidth: 0,
    spawnX: 4,
    spawnY: 1,
    shapes: [
      [
        [-1, 1],
        [0, 1],
        [1, 1],
        [0, 0], //TEE
      ],
      [
        [-1, 0],
        [0, 0],
        [1, 0],
        [2, 0], //line
      ],
      [
        [-1, -1],
        [-1, 0],
        [0, 0],
        [1, 0], //L EL
      ],
      [
        [1, -1],
        [-1, 0],
        [0, 0],
        [1, 0], //R EL
      ],
      [
        [0, -1],
        [1, -1],
        [-1, 0],
        [0, 0], // R ess
      ],
      [
        [-1, -1],
        [0, -1],
        [0, 0],
        [1, 0], //L ess
      ],
      [
        [0, -1],
        [1, -1],
        [0, 0],
        [1, 0], //square
      ],
    ],
    tempShapes: null,
    curShape: null,
    curShapeIndex: null,
    curX: 0,
    curY: 0,
    curSqs: [],
    nextShape: null,
    nextShapeDisplay: null,
    nextShapeIndex: null,
    sqs: [],
    score: 0,
    scoreDisplay: null,
    level: 1,
    levelDisplay: null,
    numLevels: 10,
    time: 0,
    maxTime: 1000,
    timeDisplay: null,
    isActive: 0,
    curComplete: false,
    timer: null,
    sTimer: null,
    speed: 700,
    lines: 0,

init: function () {
      isStart = true;
      this.canvas = document.getElementById('canvas');
      this.initBoard();
      this.initInfo();
      this.initLevelScores();
      this.initShapes();
      this.bindKeyEvents();
      this.play();
    },
    initBoard: function () {
      this.boardHeight = this.canvasHeight / this.pSize;
      this.boardWidth = this.canvasWidth / this.pSize;
      var s = this.boardHeight * this.boardWidth;
      for (var i = 0; i < s; i++) {
        this.board.push(0);
      }
      //this.boardDiv = document.getElementById('board); //for debugging
    },
    initInfo: function () {
      this.nextShapeDisplay = document.getElementById('next_shape');
      this.levelDisplay = document
        .getElementById('level')
        .getElementsByTagName('span')[0];
      this.timeDisplay = document
        .getElementById('time')
        .getElementsByTagName('span')[0];
      this.scoreDisplay = document
        .getElementById('score')
        .getElementsByTagName('span')[0];
      this.linesDisplay = document
        .getElementById('lines')
        .getElementsByTagName('span')[0];
      this.setInfo('time');
      this.setInfo('score');
      this.setInfo('level');
      this.setInfo('lines');
    },
    initShapes: function () {
      this.curSqs = [];
      this.curComplete = false;
      this.shiftTempShapes();
      this.curShapeIndex = this.tempShapes[0];
      this.curShape = this.shapes[this.curShapeIndex];
      this.initNextShape();
      this.setCurCoords(this.spawnX, this.spawnY);
      this.drawShape(this.curX, this.curY, this.curShape);
    },
    initNextShape: function () {
      if (typeof this.tempShapes[1] === 'undefined') {
        this.initTempShapes();
      }
      try {
        this.nextShapeIndex = this.tempShapes[1];
        this.nextShape = this.shapes[this.nextShapeIndex];
        this.drawNextShape();
      } catch (e) {
        throw new Error('Could not create next shape. ' + e);
      }
    },
    initTempShapes: function () {
      this.tempShapes = [];
      for (var i = 0; i < this.shapes.length; i++) {
        this.tempShapes.push(i);
      }
      var k = this.tempShapes.length;
      while (--k) {
        //Fisher Yates Shuffle
        var j = Math.floor(Math.random() * (k + 1));
        var tempk = this.tempShapes[k];
        var tempj = this.tempShapes[j];
        this.tempShapes[k] = tempj;
        this.tempShapes[j] = tempk;
      }
    },
    shiftTempShapes: function () {
      try {
        if (
          typeof this.tempShapes === 'undefined' ||
          this.tempShapes === null
        ) {
          this.initTempShapes();
        } else {
          this.tempShapes.shift();
        }
      } catch (e) {
        throw new Error('Could not shift or init tempShapes: ' + e);
      }
    },
    initTimer: function () {
      var me = this;
      var tLoop = function () {
        me.incTime();
        me.timer = setTimeout(tLoop, 2000);
      };
      this.timer = setTimeout(tLoop, 2000);
    },
    initLevelScores: function () {
      var c = 1;
      for (var i = 1; i <= this.numLevels; i++) {
        this['level' + i] = [c * 1000, 40 * i, 5 * i]; //for nxt level, row score, p sore,
        c = c + c;
      }
    },
    setInfo: function (el) {
      this[el + 'Display'].innerHTML = this[el];
    },
    drawNextShape: function () {
      var ns = [];
      for (var i = 0; i < this.nextShape.length; i++) {
        ns[i] = this.createSquare(
          this.nextShape[i][0] + 2,
          this.nextShape[i][1] + 2,
          this.nextShapeIndex
        );
      }
      this.nextShapeDisplay.innerHTML = '';
      for (var k = 0; k < ns.length; k++) {
        this.nextShapeDisplay.appendChild(ns[k]);
      }
    },
    drawShape: function (x, y, p) {
      for (var i = 0; i < p.length; i++) {
        var newX = p[i][0] + x;
        var newY = p[i][1] + y;
        this.curSqs[i] = this.createSquare(newX, newY, this.curShapeIndex);
      }
      for (var k = 0; k < this.curSqs.length; k++) {
        this.canvas.appendChild(this.curSqs[k]);
      }
    },
    createSquare: function (x, y, type) {
      var el = document.createElement('div');
      el.className = 'square type' + type;
      el.style.left = x * this.pSize + 'px';
      el.style.top = y * this.pSize + 'px';
      return el;
    },
    removeCur: function () {
      var me = this;
      this.curSqs.eachdo(function () {
        me.canvas.removeChild(this);
      });
      this.curSqs = [];
    },
    setCurCoords: function (x, y) {
      this.curX = x;
      this.curY = y;
    },
    bindKeyEvents: function () {
      var me = this;
      var event = 'keypress';
      if (this.isSafari() || this.isIE()) {
        event = 'keydown';
      }
      var cb = function (e) {
        me.handleKey(e);
      };
      if (window.addEventListener) {
        document.addEventListener(event, cb, false);
      } else {
        document.attachEvent('on' + event, cb);
      }
    },
    handleKey: function (e) {
      var c = this.whichKey(e);
      var dir = '';
      switch (c) {
        case 37:
          this.move('L');
          break;
        case 38:
          this.move('RT');
          break;
        case 39:
          this.move('R');
          break;
        case 40:
          this.move('D');
          break;
        case 27: //esc: pause
          this.togglePause();
          break;
        default:
          break;
      }
    },
    whichKey: function (e) {
      var c;
      if (window.event) {
        c = window.event.keyCode;
      } else if (e) {
        c = e.keyCode;
      }
      return c;
    },
    incTime: function () {
      this.time++;
      this.setInfo('time');
    },
    incScore: function (amount) {
      this.score = this.score + amount;
      this.setInfo('score');
    },
    incLevel: function () {
      this.level++;
      this.speed = this.speed - 75;
      this.setInfo('level');
    },
    incLines: function (num) {
      this.lines += num;
      this.setInfo('lines');
    },
    calcScore: function (args) {
      var lines = args.lines || 0;
      var shape = args.shape || false;
      var speed = args.speed || 0;
      var score = 0;

if (lines > 0) {
        score += lines * this['level' + this.level][1];
        this.incLines(lines);
      }
      if (shape === true) {
        score += shape * this['level' + this.level][2];
      }
      /*if (speed > 0){ score += speed * this["level" +this .level[3]];}*/
      this.incScore(score);
    },
    checkScore: function () {
      if (this.score >= this['level' + this.level][0]) {
        this.incLevel();
      }
    },
    gameOver: function () {
      this.clearTimers();
      isStart = false;
      this.canvas.innerHTML = '<h1>GAME OVER</h1>';
    },
    play: function () {
      var me = this;
      if (this.timer === null) {
        this.initTimer();
      }
      var gameLoop = function () {
        me.move('D');
        if (me.curComplete) {
          me.markBoardShape(me.curX, me.curY, me.curShape);
          me.curSqs.eachdo(function () {
            me.sqs.push(this);
          });
          me.calcScore({ shape: true });
          me.checkRows();
          me.checkScore();
          me.initShapes();
          me.play();
        } else {
          me.pTimer = setTimeout(gameLoop, me.speed);
        }
      };
      this.pTimer = setTimeout(gameLoop, me.speed);
      this.isActive = 1;
    },
    togglePause: function () {
      if (this.isActive === 1) {
        this.clearTimers();
        this.isActive = 0;
      } else {
        this.play();
      }
    },
    clearTimers: function () {
      clearTimeout(this.timer);
      clearTimeout(this.pTimer);
      this.timer = null;
      this.pTimer = null;
    },
    move: function (dir) {
      var s = '';
      var me = this;
      var tempX = this.curX;
      var tempY = this.curY;
      switch (dir) {
        case 'L':
          s = 'left';
          tempX -= 1;
          break;
        case 'R':
          s = 'left';
          tempX += 1;
          break;
        case 'D':
          s = 'top';
          tempY += 1;
          break;
        case 'RT':
          this.rotate();
          return true;
          break;
        default:
          throw new Error('wtf');
          break;
      }
      if (this.checkMove(tempX, tempY, this.curShape)) {
        this.curSqs.eachdo(function (i) {
          var l = parseInt(this.style[s], 10);
          dir === 'L' ? (l -= me.pSize) : (l += me.pSize);
          this.style[s] = l + 'px';
        });
        this.curX = tempX;
        this.curY = tempY;
      } else if (dir === 'D') {
        if (this.curY === 1 || this.time === this.maxTime) {
          this.gameOver();
          return false;
        }
        this.curComplete = true;
      }
    },
    rotate: function () {
      if (this.curShapeIndex !== 6) {
        //square
        var temp = [];
        this.curShape.eachdo(function () {
          temp.push([this[1] * -1, this[0]]);
        });
        if (this.checkMove(this.curX, this.curY, temp)) {
          this.curShape = temp;
          this.removeCur();
          this.drawShape(this.curX, this.curY, this.curShape);
        } else {
          throw new Error('Could not rotate!');
        }
      }
    },
    checkMove: function (x, y, p) {
      if (this.isOB(x, y, p) || this.isCollision(x, y, p)) {
        return false;
      }
      return true;
    },
    isCollision: function (x, y, p) {
      var me = this;
      var bool = false;
      p.eachdo(function () {
        var newX = this[0] + x;
        var newY = this[1] + y;
        if (me.boardPos(newX, newY) === 1) {
          bool = true;
        }
      });
      return bool;
    },
    isOB: function (x, y, p) {
      var w = this.boardWidth - 1;
      var h = this.boardHeight - 1;
      var bool = false;
      p.eachdo(function () {
        var newX = this[0] + x;
        var newY = this[1] + y;
        if (newX < 0 || newX > w || newY < 0 || newY > h) {
          bool = true;
        }
      });
      return bool;
    },
    getRowState: function (y) {
      var c = 0;
      for (var x = 0; x < this.boardWidth; x++) {
        if (this.boardPos(x, y) === 1) {
          c = c + 1;
        }
      }
      if (c === 0) {
        return 'E';
      }
      if (c === this.boardWidth) {
        return 'F';
      }
      return 'U';
    },
    checkRows: function () {
      var me = this;
      var start = this.boardHeight;
      this.curShape.eachdo(function () {
        var n = this[1] + me.curY;
        console.log(n);
        if (n < start) {
          start = n;
        }
      });
      console.log(start);

if (!Array.prototype.eachdo) {
  Array.prototype.eachdo = function (fn) {
    for (var i = 0; i < this.length; i++) {
      fn.call(this[i], i);
    }
  };
}
if (!Array.prototype.remDup) {
  Array.prototype.remDup = function () {
    var temp = [];
    for (var i = 0; i < this.length; i++) {
      var bool = true;
      for (var j = i + 1; j < this.length; j++) {
        if (this[i] === this[j]) {
          bool = false;
        }
      }
      if (bool === true) {
        temp.push(this[i]);
      }
    }
    return temp;
  };
}
  </script>
</html>

CSS

body {
    overflow: hidden;
    background: #d7d7d7;
  }
  #tetris {
    width: 360px;
    border: 1px solid black;
    padding: 20px;
  }
  #canvas {
    width: 200px;
    height: 440px;
    background-color: #000;
    position: relative;
    color: #fff;
  }
  #canvas h1 {
    margin: 0;
    padding: 0;
    text-align: center;
    font-size: 30px;
    padding-top: 200px;
  }
  .piece {
    border: 1px solid white;
    position: absolute;
  }
  
  #start{
    animation: blink .7s steps(2, start) infinite;
    background: #E1FF5F;
    border-radius: 2px;
    color: #202020;
    cursor: pointer;
    font-size: 28px;
  }
  
  @keyframes blink {
    to {
      outline: #E1FF5F solid 1px;
    }
  }
  
  .red{
    color: #f00000;
  }
  
  .square {
    position: absolute;
    width: 19px;
    height: 19px;
    border: 1px solid white;
  }
  .type0 {
    background-color: #a000f0;
  }
  .type1 {
    background-color: #00f0f0;
  }
  .type2 {
    background-color: #f0a000;
  }
  .type3 {
    background-color: #0000f0;
  }
  .type4 {
    background-color: #00f000;
  }
  .type5 {
    background-color: #f00000;
  }
  .type6 {
    background-color: #f0f000;
  }
  #next_shape {
    position: relative;
    background-color: #000;
    border: 1px solid white;
    width: 110px;
    height: 110px;
  }
  #info {
    background-color: #000;
    color: #fff;
    float: right;
    width: 110px;
    height: 420px;
    padding: 10px;
  }

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