Emulation itself is legal, but downloading an NSP from the internet is not. The only legal way to emulate in 2021 was to dump your own NSP from a modded Switch and then transfer it to your PC.
Generating deep content requires acknowledging the elephant in the room: Piracy.
The "NSP 2021" search is primarily navigated by three user archetypes:
Nintendo’s aggressive legal stance against ROM sites (shutting down ROMUniverse in 2021 specifically for Switch titles) directly correlates with why finding a clean, verified "Hyrule Warriors NSP 2021" became a dark-web treasure hunt. The file size (~10-12GB for the base + DLC) made it a target for takedown notices.
The homebrew scene in 2021 saw a rise in fake "Hyrule Warriors NSP" files. Here is how to stay safe:
Herein lies the nuance. By 2021, the Hyrule Warriors franchise had bifurcated:
The "2021" timestamp points to the post-launch lifecycle of Age of Calamity. In 2021, Nintendo released the Pulse of the Ancients DLC (May) and the Guardian of Remembrance DLC (October). Therefore, a search for "Hyrule Warriors NSP 2021" is almost certainly a quest for the complete, updated, DLC-integrated build of Age of Calamity.
The NSP file extension is associated with the Nintendo Switch. NSP files are essentially containers that hold the game data. However, directly downloading or using NSP files without owning the game or proper authorization is considered piracy and is against the terms of service of Nintendo and the laws of many countries.
In 2021, many players reported that the original Hyrule Warriors offered more stable local co-op (split Joy-Con) compared to Age of Calamity, which suffered from frame rate drops during intense battles.
By 2021, Nintendo had patched both games significantly.
Hyrule Warriors: Definitive Edition (2021 state):
Hyrule Warriors: Age of Calamity (Post-DLC 2021 patch):