Mario Kart 8 Deluxe 68.20 million pcs.
Animal Crossing: New Horizons 47.82 million pcs.
Super Smash Bros. Ultimate 36.24 million pcs.
The Legend of Zelda: Breath of the Wild 32.81 million pcs.
Super Mario Odyssey 29.28 million pcs.
Pokémon Scarlet/Pokémon Violet 26.79 million pcs.
Pokémon Sword/Pokémon Shield 26.72 million pcs.
The Legend of Zelda: Tears of the Kingdom 21.73 million pcs.
Super Mario Party 21.16 million pcs.
New Super Mario Bros. U Deluxe 18.25 million pcs.
I’m always surprised that BotW isn’t a bit higher up given how long it’s been out for and the positive press it got. I guess it’s not as casual as all the other games on this list (bar TotK, of course), but I thought it would still have wider appeal.