"Yes, actual analogue cards," Gen chuckled, and pulled one from 'mid-air' with some slight of hand, twirling it in his fingers. "I'd be happy to teach you the rules, my friend. Old-fashioned or not, it's something I can always have on me, no batteries or electricity required."

He hummed. "Ah, so. We don't know how people earn them, but they're basically the currency the train accepts here. And, yes, indeed, the fact it's currency and we don't know how to get it is really, really annoying. But! If you need to get new clothes, candy, weapons, pets, basically anything ... you can buy it from the train's store with points. Every time the train stops to pick up new people, we get more of them. In apparently random amounts."