Talk:Crystal Alchemy Store/@comment-5457689-20130130055304/@comment-5039776-20130130232844

Well, for the weekly challenges, they keep how many resources you've picked up, how many recipes you've done etc.

Those goals vanish when the challenge is compete.

They could do it that way, which is what you just described, but it'd need to stay up on your device for months. And I don't know if the info is local to your device (I suspect so via the goals), or server-side, which would enable such a competition to be run.