I don't see why geocaching.com chose to create "Challenges" over adding back in "Virtuals". I think they are one in the same, with the exception that Virtuals required a GPS coordinate, a submission, a review and a publish. These "challenges" are taking up a lot of "somebody's" time to keep up with them all, to review and either keep or delete, as well as depleting the value of getting a cache with coordinates. Even if they keep these "challenges", I think there should be an "opt-in" or "opt-out" option for those cachers who would like to do participate in the challenges, but not let it affect their "cache numbers".