MobilSpejd is a complex orienteering race, which is completed with help from a mobile phone with a camera and internet access.
All challenges have a QR-code, which will send you to a website.
Here you will find a guide on how to get to the next challenge.
When the challenge is done, you will be able to scan a new QR-code, which will send you to a new website with a task and guide on how to get to the next challenge.

This is how a QR-code look, try to scan it to read more about QR-codes.