Purchase the game from the Nintendo eShop or a physical cart. If you want to backup your own game, you can dump your legitimate cartridge into an NSP file using tools like NXDumpTool (which is legal for personal backups in some regions).
For those managing their Switch storage, here are the technical details of the file: steins gate elite nsp full
The full Switch version includes 8-bit ADV Steins;Gate , a retro-style adventure game designed in the aesthetic of 1980s Famicom games. Available Versions Purchase the game from the Nintendo eShop or a physical cart
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