Explanation

In the Pixels Challenge, you are given a blurry photo. If you zoom out enough, you can see the image becomes more clear and you can start to make out letters that are consistent with the format of a flag.

Solving the Challenge

  1. Browse to http://18.205.188.77/challenges.
  2. Click Pixels
  3. Click pixels.png
  4. Use paint.NET to open the picture pixels.png.
  5. The picture is too blurry to read, so zoom out.
  6. At approximately 6% of its actual size, I can make out the words “better than a” and at approximately 7% of its actual size I can make out what could be “mouthful of nails”
  7. Use Google to search for quote mouthful nails
  8. Click the search result for https://britishsass.tumblr.com/.
  9. There is a quote on the website that reads, “slightly better than a mouthful of nails!”
  10. Review the picture. We can see that the first letter of the first word is larger than the remaining letters, so we will assume it is a capital “S”. The second to last character does not seem to be an exclamation mark, but could be a period.
  11. Through trial and error, I confirmed my assumptions in the previous step.
  12. The flag is BTC{Slightly better than a mouthful of nails.}
  13. Paste the flag into the Flag field.
  14. Click Submit.