First Party Titles: 12
The Legend of Zelda: Breath of the Wild
Splatoon 2 - Octo Expansion
Mario Kart 8 Deluxe
Super Mario Odyssey
Xenoblade Chronicles 2
VS. Super Mario Bros.
Torna - The Golden Country
Mario Tennis Aces
Super Mario Party
NES - Nintendo Switch Online
Super Smash Bros. Ultimate
Third-Party Titles: 7
also some free downloadable titles and demos, but nothing worth noting
This is what my spreadsheet has about you:
Vs. Super Mario Bros. (D)
Breath of the Wild (P)
Mario Kart 8 (P)
Splatoon 2 (P)
Super Mario Odyssey (D)
Xenoblade Chronicles 2 (D)
10 third party games; 1 physical, 9 digital.
That raises the question how your amount of third party games could decrease, because digital games can't be sold. You've probably not noted whether your third party games were physical or digital in one of your previous posts, and in that case I add them as digital titles. But in reality they could be physical games and you sold a few of them. Clarification is appreciated.
As for your first party games, here's some clarification from my side. I do not count DLC as its own game, so Splatoon 2's Octo Expansion doesn't count. However, Torna is a special case because it was released as standalone game, so I count it as its own game. Nintendo Switch Online doesn't count as game ownership because it's a rental; games can only be played for as long people are subscribed to the service.
I need to update my list of 3rd parties. I’m at 23 physical and 18 digital.
The numbers are at 25 and 17 now, so I hope that means you sold two physical games and bought another digital one. Otherwise there has been a mistake on my end or your end somewhere. Ultimately, that's a matter of my own curiosity though, so you don't need to answer. I'll change the figures to 23 and 18 in any case.
What I do need an answer for are your first party totals. While doing the latest update, I've noticed that I hadn't entered your Pikachu game in the column of the Pokémon games during the previous update, but I am not sure if I had previously overlooked that post of yours altogether or if I only forgot to add said game to the Pokémon column. So is it 18 physical/1 digital first party games or 19/1?