For several types of certificate and ssl issues(HSTS , blacklisted/revoked certificates) that option is hidden and thus unavailble. Chrome can be a stickler, which is understandable as the majority of its users are not prepared to deal with the possible downsides of going to an untrusted page.

So this is where the "cheat code" comes in handy:

https://revoked.badssl.com/

https://subdomain.preloaded-hsts.badssl.com/

https://pinning-test.badssl.com/

Then there are those which have no "cheat code" bypass, so you'd have to use some other method:

https://rc4.badssl.com/

I remember reading some blog post that badly configured SSL certificate will cause something like 90% of people bouncing off the website because they are scared of the big red Chrome warning. SSL certificate is actually an important UX factor.

If your browser has information that the site enabled HSTS, the continue option isn't available ... that's what you need the cheat code for.