Ugh, this sounds similar to a slapp suit. I don’t know if there’s a term for companies that sue just to put someone out of business (as opposed to a patent troll, who’s goal is not to put someone out of business but instead milk them for as long as possible), but that’s probably what’s going on here. Between it being a patent suit and not a copyright suit, and Nintendo from what it sounds like is basically saying “we think you’re infringing, though we don’t know what”, it sounds like Nintendo is going for distance, not effectiveness.