I can't be very precise about the tasks we had to to, but it was a normal group exercise, how almost every other airline does it, too. Discussion and getting to conclusions.
The second part was the interview. I can just speak for myself, but I found it really okay. They asked me about me and my experiences, my goals and ambitions and why I want to work for wizzair.
Summarized, I even had some fun during those two days and met a lot of great people. Don't be afraid, just be yourself and convince them that you want the job
thats my experience.