Latin's six cases cower in comparison with Estonian's 14, which include inessive, elative, adessive, abessive, and the system is riddled with irregularities and exceptions.
Check this thread or the Season Event entries on the community portal to read the riddle which will reveal the server, the playfield and the exact spot the Mountain Goat can be found at.
This comes in many forms - figuring out the koan (or riddle) of Zendo, getting the pieces into place in Ubongo or FITS, or figuring out how to use your pieces to build a route, as in Turbo Taxi.