If you are a server admin or own a website this shouldn't be so hard.
Below you see the URL of an image.
The image is actually a php script that records how many times this image has been seen.
To solve this level the image has to be accessed by 50 unique IP addresses
This window will refresh every 10 seconds and update the view counter you see below
Keep in mind you have to keep your browser window open so your session won't run out
Your image has been seen by 0 unique IP addresses
HTML code to include on your website:
<a href="https://www.0xf.at"><img src="https://www.0xf.at/data/imgs/cf0f1968244b4fca6e9c4c50dd2a2e8b.jpg" /></a>