If your intention is to be relevant I'd say as many as possible that Project-GC has support for. Or at least those relevant to your users, which should be identifiable on user data or by making a poll or something.

Honestly, the way you've handled the app, peoples suggestions and people trying to help you these last two years doesn't make me very interested in helping you with that question.

I might have misunderstood this question due to the language issue, but my understanding is that there have been some large changes to what is available in the API. Reading the API documentation now it seems like you should be able to get the found status of an Adventure Lab. Any chance to look at this again?

This was on the live map and it happened on two caches that I loaded out of the ~20 I loaded during that caching trip. Not a huge problem for me personally, but since it looks so odd I thought I'd mention it here. You never know when that odd thing turns out to be a clue to some annoying bug or something! :) 

Cachly seem to have reworked their attributes filter (or the design is different for phone and tablet since I don't have an iphone anymore), but it used to be that the filters opened a new view, there you could select either "rules" or "attributes". Selecting attributes gave you a list of the attributes and you could click on those you wanted to include in the filter, clicking rules you could select things like "must include all", "exclude all" or "contains at least one" or something like that, so basically AND, NOT, OR. 

I'm thinking something similar could be done within the current design, clicking "attributes" in the filters box could give a new "page" of the box where attributes could be selected and maybe some buttons for and/or/not? I'm thinking that step one is to be able to do some basic filtering for attributes, like find all caches with fieldpuzzle or all challenges for example, the more advanced configuration would be icing on the cake but even without that icing I'd still want cake. ;)