New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  didWin: false,
  
  draw: function() {
    this.set('didWin', true);
  }
});

templates.application.hbs

<h1>Claim your prize</h1>

{{#if this.didWin}}
  <h2>You won a switch!!!</h2>
{{else}}
  <button {{action this.draw}}>What is it gonna be? ($500 per play)</button>
{{/if}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}