OSINT - A Mirror would be useful

Challenge description:

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Challenge files:

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Solution:

According to the description, we need to find the number on the back of that shirt, and the best way to find that is to reverse search that image, and I used Google to do that:

<br/><br/> So, the flag is:

flag{29}

Original writeup (https://github.com/Cyb3rDoctor/e-Jornadas_CTF/blob/main/A_Mirror_would_be_useful.md).