JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div class="jumbotron">
      <h1>Try Cheat Code</h1>
      <p>Input the Konami Code (up, up, down, down, left, right, left, right, B, A, Enter)</p>
    </div>
    <img src="http://img1.wikia.nocookie.net/__cb20110816210501/fantendo/images/3/3c/Sprite-mario-running-animation.gif" id="easter-egg"/>
</body>

CSS

#easter-egg
{
    display : none;
}

JavaScript

/**
* jquery-cheat-code-plugin.js - jQuery Plugin
* Create a custom event that listens for a cheat code in your app
*
* @dependencies	jQuery v1.5.0 http://jquery.com
* @author			Marc Cusso <marcbaro22@gmail.com>
* @copyright		Author

* @version		0.0.1 (02/07/2015)
*/

function CheatCodeEventHandler(element){

  function CheatCodeController(){
    this.sequence = [
      'up',
      'up',
      'down',
      'down',
      'left',
      'right',
      'left',
      'right',
      'B',
      'A',
      'Start'
    ];

    this.mapping = {
      38 : 'up',
      40 : 'down',
      37 : 'left',
      39 : 'right',
      65 : 'A',
      66 : 'B',
      13 : 'Start'
    };

    this.state = 0;

    this.cheatOn = false;

    this.advanceState = function(keyPressed){
      this.cheatOn = false;
      var value = this.mapping[keyPressed];
      if(this.sequence[this.state++] == value){
        if(this.state == this.sequence.length){
          this.cheatOn = true;
          this.state = 0;
        }
      }
      else{
        this.state = 0;
      }
    };
  };

  this.cheatController = new CheatCodeController();

  var context = this;

  this.inputMapping = function(mapping){
    if(!mapping) return this.cheatController.mapping;
    else{
      this.cheatController.mapping = mapping; //TODO validate mapping
      this.cheatController.state = 0;
      this.cheatController.cheatOn = false;
    }
  };

  function validateCheatSequence(sequence){
    var mapping = context.inputMapping();
    for(i=0;i<sequence.length;++i){
      var found = false;
      Object.keys(mapping).forEach(function (key) {
        var val = mapping[key];
        if(val == sequence[i]) found = true;
      });
      if(!found) return false;
    }
    return true;
  }

  this.cheatSequence = function(sequence){
    if(!sequence) return this.cheatController.sequence;
    else{
      if(validateCheatSequence(sequence)){
        this.cheatController.sequence = sequence;
        this.cheatController.state...