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You have been chosen to participate in a selection process for a secret underground group. To make sure you're worthy, they test you with a series of devious puzzles. However, one in particular has you stumped...

The challenge you receive is as follows:

People aren't very good at observing things. We hope you are better.
To solve this challenge, you will need to inspect the contents of the link below:

http://i.stack.imgur.com/XKGpe.png

We look forward to your success.
- The Underground Group

The solution is obvious once found, and requires no special skills to uncover.
But, of course, you need to keep your eyes and mind open...

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  • $\begingroup$ Well, the displayed link is different from the actual link. But it tells me "The image you are requesting does not exist or is no longer available." Or is this a red herring? $\endgroup$ – Glorfindel May 22 '15 at 7:55
  • $\begingroup$ @Glorfindel It's not a red herring; look closer. However, I don't know what the clue means... $\endgroup$ – Ken Y-N May 22 '15 at 8:08
  • $\begingroup$ Wow, another great puzzle! $\endgroup$ – Rand al'Thor May 22 '15 at 8:36
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Not done yet, I think, but:

Using the fill option in paint, this came out:

Keep looking!

Also:

The displayed and actual link are different. Following the displayed link shows:

Again, filling it in in paint shows:

So, is the answer 404? Or is it something to do with either imgur or PSE's 404 page?

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  • $\begingroup$ Yes, this is correct. $\endgroup$ – Tryth May 22 '15 at 8:28
  • $\begingroup$ Ah, so the lack of a dot on the i of imgur.com was a red herring? $\endgroup$ – Ken Y-N May 22 '15 at 11:50
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The solution is

404

How it's hidden...

The linked image is described as http://i.stack.imgur.com/XKGpe.png but actually points to http://i.stack.imgur.com/X2plV.png/. The image actually linked to contains very faint text that reads Keep Looking. The file XKGpe.png contains to real solution. Using a flood fill or colour replacement tool will reveal the text.

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  • $\begingroup$ This is correct. However the other answer is faster so I will accept that one. But you still get a +1 :D $\endgroup$ – Tryth May 22 '15 at 8:29

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