How are these back links achieved?

A lot of hardwork to get quality backlinks. He could be using sitewide backlinks.

Here's what Blekko has to say about
Hypnotic World:

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Tyrus

You said it yourself, one of the best you've seen, people link to them for free naturally

If you look at pre-sell pages set up for top Clickbank products you will find that many of the review sites have many dozens (even hundreds) of internal pages each reviewing (and I use that term loosely) an individual product. The pages are interlinked.

I don't know how Google counts such internal links, but they must be of value because many of these sites rely on internal linking for the majority of their back-links. It seems to work. --Mike

You should spend more time thinking about how you can create content that appeals to online communities who'd give you quality backlinks. In other words, participate in forums, groups on blogging websites, social bookmarking websites, etc. so you can identify with those people, and know what they want rather than trying to blindly take stabs at it.

Q: How do you identify a want?
A: You participate in communities and ask questions like, "Does anybody else blah blah blah?" If it gets a lot of traction then you know it's a common problem, and you should design your content around solving that problem or use it to entertain them by satirizing the situation. You can also identify a want by lurking and taking notes on threads, submissions, etc. that get a ton of traction, but if you want to be rewarded you must be an active community member.

When you're creating content don't think about what "the people" want. Because there's no such thing as "the people", just communities that have already congregated elsewhere on the Internet. If you want to be rewarded with backlinks, sales, emails, or whatever you need to do something positive for those communities.

Interlinking your site pages can bring such backlinks but these are of not much value and somewhere it comes in Onpage optimization.