I also stumbled upon the same Numberphile video! Puzzle & Dragons is available in English and has a small following in North America. (There was also a version of the app in Europe but it got shut down a few years back.) Most of the English-speaking community is on Reddit and Discord now. As for why there are several glitch tokens related to the game: My guess is that it's pretty similar to what happened with the r/counting subreddit. P&D related terms would probably only come up within r/puzzleanddragons and the Discord server. There used to be several large English websites about the game, namely puzzledragonx and padforum, but those both disappeared... (read more)
I also stumbled upon the same Numberphile video! Puzzle & Dragons is available in English and has a small following in North America. (There was also a version of the app in Europe but it got shut down a few years back.) Most of the English-speaking community is on Reddit and Discord now. As for why there are several glitch tokens related to the game: My guess is that it's pretty similar to what happened with the r/counting subreddit. P&D related terms would probably only come up within r/puzzleanddragons and the Discord server. There used to be several large English websites about the game, namely puzzledragonx and padforum, but those both disappeared... (read more)