This mystery cache is a challenge cache so the box is at the given coordinates but, in order to log this, you have to fulfill a certain task.
Mures county has 7 types of "permanent" caches.
In order to log this challenge cache you need to find first at least one cache of each type of cache hidden in Mures county. It doesn't matter when you find a certain type, before or after the publication date of this challenge, the only condition for the cache is to be in Mures county.
Example log:
[njlevente](https://www.geocaching.com/profile/?u=njlevente) has used [Project-GC](https://project-gc.com/Challenges/GC9C6P0/61151 "Project-GC Challenge Checker") to see if they qualified for this challenge and they did.
Earthcache - GC4GBKD / Mureș / [GQ5] Targu Mures earthcache / 2015-08-26
Letterbox Hybrid - GC1WECN / Mureș / Sighisoara info point / 2017-08-13
Multi-cache - GCX96C / Mureș / The Middle-age Fortress / 2016-02-29
Traditional Cache - GCNAFT / Mureș / Mocsárerdo / 2020-01-05
Unknown Cache - GC1WN3K / Mureș / YEI#22 - Sighi...gogue / 2020-09-13
Virtual Cache - GC7B6X5 / Mureș / Sighisoara Virtual Cache / 2018-07-08
Wherigo Cache - GC1WXP6 / Mureș / Sighisoara Guilds Towers / 2016-04-15