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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              
            
          
!

CSS

            
              html, body {
  height: 100%;
}

body {
  margin: 0;
  padding: 0;
  background: #111;
  color: #eee;
  font: caption;
}

.dg {
  font: caption !important;
  text-shadow: none !important;
}

.dg .property-name {
  font: small-caption !important;
  line-height: 27px !important;
}
            
          
!

JS

            
              console.clear();

var gameOptions = {
  // maximum length of the sum
  maxSumLen: 5,

  // local storage name used to save high score
  localStorageName: "oneplustwo",

  // time allowed to answer a question, in milliseconds
  timeToAnswer: 4000,

  // score needed to increase difficulty
  nextLevel: 400
};

// "PlayGame" state

var Questions = {
  
  // when the state preloads...
  
  preload: function() {
    // making the game cover the biggest window area possible while showing all content
    game.scale.scaleMode = Phaser.ScaleManager.SHOW_ALL;
    // game.scale.pageAlignHorizontally = true;
    // game.scale.pageAlignVertically = true;

    // do not pause the game when it loses focus
    game.stage.disableVisibilityChange = true;
    
    // game.load.crossOrigin = "anonymous";
    
    // preloading images
    game.load.image("timebar", "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMgAAAAyCAQAAACzWFxqAAAAW0lEQVR42u3RMQEAAAgDINc/9Kzg6QEVSDs8EiFCECIEIUIQIgQhQhCCECEIEYIQIQgRghCECEGIEIQIQYgQhCBECEKEIEQIQoQgBCFCECIEIUIQIgQhCBHC1QIrWmPPuJC0vwAAAABJRU5ErkJggg==");

    // preloading a spritesheet where each sprite is 400x50 pixels
    game.load.spritesheet("buttons", "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAACWCAQAAABamBbuAAABJ0lEQVR42u3TMQEAAAgDINc/9Ezg7wEdSDvAIYKAICAICAKCgCAgCAgCgoAggCAgCAgCgoAgIAgIAoKAICAIIAgIAoKAICAICAKCgCAgCCAICAKCgCAgCAgCgoAgIAgIAggCgoAgIAgIAoKAICAICAIIAoKAICAICAKCgCAgCAgCggCCgCAgCAgCgoAgIAgIAoIAgoAgIAgIAoKAICAICAKCgCCAICAICAKCgCAgCAgCgoAgIIggIAgIAoKAICAICAKCgCAgCCAICAKCgCAgCAgCgoAgIAgIAggCgoAgIAgIAoKAICAICAIIAoKAICAICAKCgCAgCAgCggCCgCAgCAgCgoAgIAgIAoIAgoAgIAgIAoKAICAICAKCgCCAICAICAKCgCDw1QKVkCt6E6fLNgAAAABJRU5ErkJggg==", 400, 50);
  }, 
  
  // when the state has been created...
  
  create: function() {
    console.log("create", this);
    
    game.stage.backgroundColor = "#0D0D73";

    // it's not game over yet...
    this.isGameOver = false;

    // current score is set to zero
    this.score = 0;

    // we'll also keep track of correct answers
    this.correctAnswers = 0;

    // topScore gets the previously saved value in local storage if any, zero otherwise
    this.topScore =
      localStorage.getItem(gameOptions.localStorageName) == null
        ? 0
        : localStorage.getItem(gameOptions.localStorageName);

    // sumsArray is the array with all possible questions
    this.sumsArray = [];

    // rather than tossing a random question each time, I found easier
    // to store all possible questions in an array then draw a random question
    // each time. I just need an algorithm to generate all possible questions.

    // let's start building all possible questions with this loop
    // ranging from 1 (only one operator, like 1+1) to maxSumLen
    // (in this case 5, like 1+1+1+1-1-1)
    for (var i = 1; i < gameOptions.maxSumLen; i++) {
      // defining sumsArray[i] as an array of three empty arrays
      this.sumsArray[i] = [[], [], []];

      // looping from 1 to 3, which are the possible results of each sum
      for (var j = 1; j <= 3; j++) {
        // buildTrees is the core of the script, see it explained
        // some lines below
        this.buildThrees(j, 1, i, j);
      }
    }

    // try this! You will see all possible combinations
    console.log(this.sumsArray);

    // questionText is the text object which will display the question
    this.questionText = game.add.text(250, 160, "-", {
      font: "bold 72px Arial"
    });

    // setting questionText registration point
    this.questionText.anchor.set(0.5);

    // scoreText will keep the current score
    this.scoreText = game.add.text(10, 10, "-", {
      font: "bold 24px Arial"
    });

    // loop to create the three answer buttons
    for (i = 0; i < 3; i++) {
      // creation of the answer button, set to frame "i"
      // Calls checkAnswer callback function once triggered
      var btn = game.add.button(50, 250 + i * 75, "buttons", this.checkAnswer, this);
      console.log("add button", btn.x, btn.y);
    }

    // adding the time bar
    var numberTimer = game.add.sprite(50, 250, "timebar");

    // creation of a graphic mask covering the three answer buttons
    this.buttonMask = game.add.graphics(50, 250);
    this.buttonMask.beginFill(0xffffff);
    this.buttonMask.drawRect(0, 0, 400, 200);
    this.buttonMask.endFill();
    // numberTimer.mask = this.buttonMask;
    this.buttonMask.alpha = 0.2;

    // method to ask next question
    this.nextNumber();
        
    // game.debug.displayList();
  },

  // buildThrees method, it will find all possible sums
  // arguments:
  // initialNumber: the first number. Each question always start with a positive number
  // currentIndex: it's the amount of operands already placed in the sum
  // limit: the max amount of operands allowed in the question
  // currentString: the string generated so far
  buildThrees: function(initialNummber, currentIndex, limit, currentString) {
    // the possible operands, from -3 to 3, excluding the zero
    var numbersArray = [-3, -2, -1, 1, 2, 3];

    // looping from 0 to numbersArray's length
    for (var i = 0; i < numbersArray.length; i++) {
      // "sum" is the sum between the first number and current numberArray item
      var sum = initialNummber + numbersArray[i];

      // output string is generated by the concatenation of current string with
      // current numbersArray item. I am adding a "+" if the item is greater than zero,
      // otherwise it already has its "-"
      var outputString =
        currentString + (numbersArray[i] < 0 ? "" : "+") + numbersArray[i];

      // if sum is between 1 and 3 and we reached the limit of operands we want...
      if (sum > 0 && sum < 4 && currentIndex == limit) {
        // then push the output string into sumsArray[amount of operands][result]
        this.sumsArray[limit][sum - 1].push(outputString);
      }

      // if the amount of operands is still below the amount we want...
      if (currentIndex < limit) {
        // recursively calling buildThrees, passing as arguments:
        // the current sum
        // the new amount of operands
        // the amount of operands we want
        // the current output string
        this.buildThrees(sum, currentIndex + 1, limit, outputString);
      }
    }
  },

  // this method asks next question
  nextNumber: function() {
    // updating score text
    this.scoreText.text =
      "Score: " +
      this.score.toString() +
      "\nBest Score: " +
      this.topScore.toString();

    // if we already answered more than one question...
    if (this.correctAnswers > 1) {
      // stopping time tween
      this.timeTween.stop();

      // resetting mask horizontal position
      this.buttonMask.x = 50;
    }

    // if we already answered at least one question...
    if (this.correctAnswers > 0) {
      // tween to slide out the mask, unvealing what's behind it
      this.timeTween = game.add.tween(this.buttonMask).to(
        {
          x: -350
        },
        gameOptions.timeToAnswer,
        Phaser.Easing.Linear.None,
        true
      );

      // callback to be triggered when the tween ends
      this.timeTween.onComplete.add(function() {
        // calling "gameOver" method. "?" is the string to display
        this.gameOver("?");
      }, this);
    }

    // drawing a random result between 0 and 2 (it will be from 1 to 3)
    this.randomSum = game.rnd.between(0, 2);

    // choosing question length according to current score
    var questionLength = Math.min(
      Math.floor(this.score / gameOptions.nextLevel) + 1,
      4
    );

    // updating question text
    this.questionText.text = this.sumsArray[questionLength][this.randomSum][
      game.rnd.between(
        0,
        this.sumsArray[questionLength][this.randomSum].length - 1
      )
    ];
  },

  // method to check the answer, the argument is the button pressed
  checkAnswer: function(button) {
    // we check the answer only if it's not game over yet
    if (!this.isGameOver) {
      // button frame is equal to randomSum means the answer is correct
      if (button.frame == this.randomSum) {
        // score is increased according to the time spent to answer
        this.score += Math.floor((this.buttonMask.x + 350) / 4);

        // one more correct answer
        this.correctAnswers++;

        // moving on to next question
        this.nextNumber();
      } else {
        // wrong answer
        // if it's not the first question...
        if (this.correctAnswers > 1) {
          // stop the tween
          this.timeTween.stop();
        }

        // calling "gameOver" method. "button.frame + 1" is the string to display
        this.gameOver(button.frame + 1);
      }
    }
  },

  // method to end the game. The argument is the string to write
  gameOver: function(gameOverString) {
    console.log("gameOver", gameOverString);
    
    // displaying game over text
    this.questionText.text = this.questionText.text + " = " + gameOverString;

    // now it's game over
    this.isGameOver = true;

    // updating top score in local storage
    localStorage.setItem(
      gameOptions.localStorageName,
      Math.max(this.score, this.topScore)
    );

    // restart the game after two seconds
    game.time.events.add(
      Phaser.Timer.SECOND * 2,
      function() {
        this.game.state.start("Game_Over");
      },
      this
    );
  }
};

var Game_Over = {
  
  create: function () {
    game.add.text(0, 0, "Game Over :(", {fill: "orange"});
  }
  
};

game = new Phaser.Game();

game.state.add("Questions", Questions);
game.state.add("Game_Over", Game_Over);

game.state.start("Questions");

            
          
!
999px

Console