The PC Mega link is pointing to an APK file instead.
Yeah, I messed up a link update. Should be fixed now.
The Android version on the MEGA link should also work now - I tested it myself on an Android device and it was OK.
The Celts lived in a fairly harsh environment where nuts would have been important forage through winter.
At their height in the days of the early Roman Republic and late Greek antiquity, Celtic peoples (which is a very broad term) covered South Eastern and Central Europe (minus Germany and Scandinavia), as well as modern France, Spain and the British Isles. So a lot of the land was actually very rich for farming and grazing. Before their colonization by the English, the Irish were a very well-fed people, mainly because their land was excellent for cattle grazing, and from that you get meat and milk.
A feature of Irish mythology that appears often (especially in the Ulster Cycle) is wealth measured by the size of cattle herds. Great battles are also fought on the pre-text of cattle raids. Ireland's greatest epic story is basically a cattle raid (the
Táin Bó Cúailnge). So we can imagine Celtic Ireland as being a place where different tribes and clans lived around the earthen hill forts of their chiefs and they raided each other.