I didn't know about this challenge, but apparently there is a challenge that is released annually around Easter time. You may want to check it out. It's here:
https://hackyeaster.hacking-lab.com
I completed the teaser challenge several days ago. I'm looking forward to seeing what they come up with for the rest of the challenge.
Be patient with the creators. Apparently it can take some time for them to judge the answers so you can move on, and they are people that volunteer to do so. Thanks to those people that put time into judging the submissions. :)