Challenges are listed by skill and can be viewed by selecting a skill in the drop down menu in challenge tab of the noticeboard. The choices of challenges are the same for every player. Challenges that require levels that the player does not have are not visible and cannot be selected by the player. To activate these challenges, players must "pin" the challenge. Once pinned, the challenge system tracks the player's completion progress. Progress will continue to be tracked even if the challenge has been unpinned. A full list of challenges can be found here.