First, open CodePen by visiting https://codepen.io and create a new project.

CodePen: How to create a new project

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To create a new project or 'pen' in CodePen, open the website codepen.io and:

1. Click the 'Start Coding' button
2. This will create a new project (or 'pen') and bring you to online editor.

In this step, we will add the HTML structure for our Interactive Quiz Game. Add the following HTML code to the HTML section of your CodePen:

<h1>Interactive Quiz Game</h1>
<div id='quiz'></div>
<div id='result'></div>
<div id='score'></div>

Here's a brief explanation of each element:

• <h1>Interactive Quiz Game</h1>: This is the main heading of our quiz game.
• <div id='quiz'></div>: This div will contain the questions and answer options for our quiz.
• <div id='result'></div>: This div will display the result of the user's answer, whether it's correct or incorrect.
• <div id='score'></div>: This div will show the user's score when they complete the quiz.

Now let's add some styling to our HTML elements to make them look better.

Add the following CSS code to the CSS section of your CodePen:

body {
  font-family: Arial, sans-serif;
  background-color: #f0f0f0;
  padding: 20px;
}

h1 {
  text-align: center;
}

#quiz {
  background-color: #fff;
  padding: 20px;
  border-radius: 5px;
}

.answer {
  display: block;
  margin: 20px auto;
  background-color: #007bff;
  border: none;
  color: #fff;
  padding: 10px 20px;
  border-radius: 5px;
  cursor: pointer;
}

.answer:hover {
  background-color: #0056b3;
}

#result, #score {
  text-align: center;
  font-size: 24px;
  font-weight: bold;
}

Before we can use jQuery in our JavaScript, we need to add the jQuery library to the project. In CodePen this is a setting rather than code:

1. Click the Settings button at the top of CodePen and choose the JS tab (or click the gear icon on the JS panel).
2. Under Add External Scripts/Pens, type jquery into the search box.
3. Select jquery from the list that appears, then click Save & Close.

jQuery is a popular JavaScript library that makes it much easier to select parts of the page and change them — you'll recognise it by the $ symbol in the code we write next.

CodePen: How to add a JavaScript Library

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To add a JavaScript library to your CodePen project, follow these steps:

1. Click on the 'Settings' button.
2. Click on 'JS' for the JavaScript settings.
3. In the 'Add External Scripts/Pens' section search for the JavaScript library you wish to add i.e. jQuery.
4. Click on the library you wish to add in the results that show.
5. Click the 'Close' button and the library is now available in your project.