ville.monkkonen: I've decided to remove the mystery box sharing button from newer versions of the game. It's original purpose was to be able to share the game to a friend more easily and encourage you to share it, but I can see the idea wasn't very good. When I remove it, the game will require your mystery boxes to be opened by getting achievements. I believe the boxes that have already opened will still grant their bonuses, but getting any further boxes opened will require you to catch up with the achievements.