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In 3.0 we are introducing filtering of Offline Lists. Here are the proposed filter options, please feel free to give input and suggest additional filters. Attributes Cache Type Container Size Country Date Placed Difficulty Distance DNF Favorites Found GC Code Has Corrected Coordinates Has Images Has Personal Cache Note Has Trackables Is Archived Is Available Is Highlighted Is Ignored Is Premium Logs contain text Long Description Owned Owner Name Personal Cache Note Placed By Short Description State Terrain Title Trackables count NOTE: Text filters such as description, title, placed by, etc will have the following options: Begins with Ends with Matches Contains Numeric filters such as terrain, difficulty etc will have the following options: Is less than Is less than or equal to Is greater than Is greater than or equal to Is equal to Is not equal to

You will probably have to refresh the offline caches once they are published

Challenge caches are mystery caches as far as Geocaching.com treats them. As far as interfacing thru the API, I would expect nothing different. Most challenge caches have the posted coordinates as the cache location vs a mystery challenge that normally has the posted coordinates not matching where the cache is placed. What makes it a "challenge" is you need to satisfy some requirement such as find 7 different cache types in a day or find a cache in 20 different states or find 7 caches that total more than 500 favorite points, etc. A challenge cache is now one that provides a way to validate the challenge has been met through a script at Project-GC usually by a link placed on the cache page. You can sign the log and claim a find on the cache if you meet the requirement and find the cache. You can always sign the log but you can't claim it as found on gc.com until the challenge criteria is met. http://project-gc.com/Tools/Challenges?map is where you can find them and the site tries to pre-determine which you qualify for. Use https://www.geocaching.com/geocache/GC40H0A_frankenstein-challenge as an example. The coordinates for that cache are the coordinates of where the cache container is located. You can see a link in the cache page on the right side to the Challenge Checker on the PGC site. Sometimes they are just in the body of the cache page. If you click it, you are taken to the PGC site ( http://project-gc.com/Challenges/GC40H0A/11154 ) and you can run the checker for yourself and see if you qualify. The output from the checker will tell you yes or no and usually show you the info you might need to paste into your log to prove to the cache owner you qualified for the challenge.

Just an idea to consider. What I do for challenge caches which I qualify is I update the posted coord on GC.com with the same coord. GC, Project GC and Cachly treated is corrected coords. This trick shows a triangle in Cachly even though the coords are the original. I use Project-GC for seeing what challenges as I qualify for and then update the coordinates on the gc.com site for the challenge cache. There's no distinction between a solved mystery and a qualified challenge, but the indication would show it might be worth going after. Just a thought you could do in the interim if a more permanent solution was coming.