Diablo 4 is on Switch 2 now, and you can play most of it without a Switch Online subscription
Most of Sanctuary is subscription-free. Your purchased Platinum is not.
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Hell is going portable, and Diablo 4 on Switch 2 is launching with everything included
The Season of Hell's Legacy brings back Deckard Cain and sends him straight to the new console.
Diablo 4 on Switch 2 reportedly releases September 15, with pre-orders opening during BlizzCon
A known leaker points to a mid-September launch, both expansions in the box, and pre-orders the day BlizzCon opens.