The unlock code is a number. You won't be given the number. It is a puzzle where you prove that you have the pre-requisite skills for this course. You need to figure the number out yourself. There are clues in this page and the links from this page.
It is not too long and has none of those funny hex (abcde) characters. It is a very significant number with that makes a regular appearance throughout Dr. Chuck's other online courses (Python, Django, PHP, and PostgreSQL).
If you get tired of trying to guess the number, you can take a fun break and look at some cool pictures of Dr. Chuck's Race Car. It is pretty awesome and he races in a series called 24 Hours of Lemons.
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