Phaser Game

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/phaser/2.0.3/phaser.min.js"></script>

JavaScript

var game = new Phaser.Game(640, 280, Phaser.AUTO, 'Boxes', {preload: preload,
    create: create, update: update, render: render});

var box;
var largeBox;
var jumping = false;
var speed = 300;

function preload() {
  game.load.image('box', 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAD4AAABDCAYAAADEfbZbAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAAFiUAABYlAUlSJPAAAABrSURBVHhe7c8xAYAwEMDAp96Z8IiVdqmLyy2Z87zfvwe0bjmNaxrXNK5pXNO4pnFN45rGNY1rGtc0rmlc07imcU3jmsY1jWsa1zSuaVzTuKZxTeOaxjWNaxrXNK5pXNO4pnFN45rGNej4zAH+KwNzs2NxVwAAAABJRU5ErkJggg==');
  game.load.image('largebox',...