The challenge is to have found at least 5 lab caches. These are special caches that are usually at mega events. There are short term caches that are experimental. See the website below for more detail. https://labs.geocaching.com/
The cache is on the Southington rail trail and the Southington Parks and Recreation is very supportive of geocachers and getting people outdoors and using the trails!
Careful of muggles - they are always around!