Wii/DS each had ten 10-million-plus sellers. Switch has five and it's not even 2 years old

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Kakadu18 said:

Also Luigi's Mansion 3, 3D World and maybe SMM2.

That's a good point, I did overlook the first two, though I have a feeling the third will fall just short.

That would make for 16 total just given what's been released and announced so far, and there's likely still several we don't know about yet.

It may well reach 20 and double the Wii and DS.