Once legally purchased, the game can be played entirely offline for single-player and local couch co-op without requiring a Nintendo Switch Online subscription. Game Sharing:

The NSP free download of Diablo III Eternal Collection on Switch includes the base game and all the expansions. However, it's essential to note that downloading the game from unofficial sources can pose risks, such as malware and data corruption.

: Contains the base game, the Reaper of Souls expansion, and the Rise of the Necromancer pack.