Codecademy "Hidden" Courses
Update: Most or all of these courses have now been deleted from Codecademy's website, so this is essentially a collection of dead links now. You can see the current Codecademy courses at https://www.codecademy.com/catalog/subject/all.
Here are some of the "hidden" courses on Codecademy that I've found:
(Old) Make a Website: https://www.codecademy.com/skills/make-a-website
Web Projects: https://www.codecademy.com/tracks/projects
Code Year: https://www.codecademy.com/en/tracks/code-year
Hour of Code - Sun, Earth, and Code: https://www.codecademy.com/en/courses/web-beginner-en-ymqg0/0/1
Teach Yourself Python: https://www.codecademy.com/courses/python-beginner-en-fymF4/0/1
Data management for scientists: https://www.codecademy.com/courses/data-management-for-scientists/0/1
Enhance your website: https://www.codecademy.com/courses/web-beginner-en-AgcGq/0/1
Reading or Beginning HTML: https://www.codecademy.com/courses/web-beginner-en-uITVm/0/1
HTML BASICS: https://www.codecademy.com/courses/web-beginner-en-MWF0C-FYSv3-r1rYm/0/1
How To Make JS Your Own: https://www.codecademy.com/courses/javascript-intermediate-en-2nQQb/0/1
Testing Your Code: https://www.codecademy.com/courses/testing-your-code/0/1
Christmas Presents - Review of Objects: https://www.codecademy.com/courses/javascript-beginner-en-JSxzj/0/1
The Date Object: https://www.codecademy.com/courses/the-date-object/0/1
JQuery (Original): https://www.codecademy.com/en/tracks/jquery-original
CSS: Coding With Style: https://www.codecademy.com/courses/css-coding-with-style/0/1
Advanced CSS Positioning: https://www.codecademy.com/courses/advanced-css-positioning/0/1
CfE Computer Science: https://www.codecademy.com/courses/web-beginner-en-8l45k/0/1
JQuery and Ajax: https://www.codecademy.com/courses/javascript-beginner-en-g7vdk/0/1
Track(2):Intro to the DOM: https://www.codecademy.com/courses/intro-to-the-dom/1/1
Teach Yourself JavaScript: https://www.codecademy.com/en/tracks/teachyourself
Recursion in JavaScript: https://www.codecademy.com/courses/javascript-lesson-205/2/1
Multimedia Projects (Demo): https://www.codecademy.com/tracks/multimedia-demo
AngularJs: https://www.codecademy.com/courses/javascript-advanced-en-2hJ3J/0/1
Web (Original): https://www.codecademy.com/en/tracks/web-original
Hour of code: Start Programming!: https://www.codecademy.com/courses/intro-to-JS-hour-of-code/0/1
Mastering Markdown: https://www.codecademy.com/courses/web-intermediate-en-Bw3bg/0/1
Novice Values & Variables: https://www.codecademy.com/courses/novice-variables/0/1
Web Fundamentals Course[Original]: http://www.codecademy.com/en/tracks/web-original
HTML + JavaScript + CSS: https://www.codecademy.com/courses/html-javascript-css/0/1
Mandrill API: https://www.codecademy.com/en/tracks/mandrill
YouTube API: https://www.codecademy.com/en/tracks/youtube
Twitter API: https://www.codecademy.com/en/tracks/twitter
npr API: https://www.codecademy.com/en/tracks/npr
Evernote API: https://www.codecademy.com/en/tracks/evernote
BOX API: https://www.codecademy.com/en/tracks/box_api
SoundCloud API: https://www.codecademy.com/en/tracks/soundcloud
Big O: https://www.codecademy.com/courses/big-o/0/1
PHP Functions: https://www.codecademy.com/courses/web-beginner-en-7I7Xm/0/1
PHP Object oriented (classes): https://www.codecademy.com/courses/web-beginner-en-bH5s3/0/1
PHP Arrays: https://www.codecademy.com/courses/web-beginner-en-8a35h/0/1