An .nsp file is a digital game package for the Nintendo Switch.

Released alongside Pokémon Sword , this entry introduced the Galar region. It was a significant shift for the series, moving toward more open-world elements and high-definition visuals.

The "Dynamax" mechanic allows Pokémon to grow to massive sizes for three turns, adding a cinematic (if slightly repetitive) layer to gym battles.

To use this, the file must be extracted (using a tool like 7-Zip or WinRAR) to reveal the .nsp file, which is then typically used with custom firmware or emulators.