Trencrom Hill was also used as a spot from which to throw stones at St Michael’s Mount:
In several parts of Cornwall there are evidences that these Titans were a sportive race. Huge rocks are preserved to show where they played at trap-ball, at hurling, and other athletic games. The giants of Trecrobben and St Michael’s Mount often met for a game at bob-buttons. The Mount was the “bob,” on which flat masses of granite were placed to serve as buttons, and Trecrobben Hill was the “mit,” or the spot from which the throw was made. This order was sometimes reversed. On the outside of St Michael’s Mount, many a granite slab which had been knocked off the “bob” is yet to be ‘found; and numerous piles of rough cubical masses of the same rock, said to be the granite of Trecrobben Hill, [a] show how eagerly the game was played.
Also from Hunt’s book, online at the sacred texts archive.
sacred-texts.com/neu/eng/prwe/prwe009.htm
Hunt mentions that “Trecrobben Hill still exhibits the bowl in which the giants of the west used to wash.” – so you may wish to keep your eyes open for this if you visit. This is presumably ‘The Bowl Rock’, on the stream to the NE, judging from the OS map.