The pain tolerance part reminds me of the simple game where two players slap each others' hand in turn; the turn switches when the receiver manages to dodge a s

The pain tolerance part reminds me of the simple game where two players slap each others' hand in turn; the turn switches when the receiver manages to dodge a slap, but gets punished with a free slap if they twitch on a fake attack. More specifically the version with knuckle hits instead of slaps, which was somewhat common on bus rides between kids. Not sure it's a great game mechanic, it usually stopped more out of “well enough of this”/“the teacher will notice that amount of blood” than out of winning or any feeling of success. At best you get a feeling of camaradery and very dulling pain. Can't find videos, only of something called bloody knuckles which doesn't seem to be the same thing—anyway I don't recommend reproducing this game unless you're like a 12 year old child trying to fit in at the back of the bus.