Iirc this was the first site I registered on. About 5 or 6 years ago. Didn't get far
Then I forgot all about it for a few years, until we started WeChall.
Now I have finally completed all challenges there.
A very good site, really a challenge.
At first I really hated it that you had to solve each challenge before you can access the next, but now I think it's good.
It forces you to really focus on each and every one. I don't think I would have reached 100% if it were otherwise.
Thanks +Mala for this site, and thanks to all the helpful people in the forum there.
PS: level 23 is broken and should be removed.