Platform: Nintendo Switch
Release date: December 7, 2018
Genre: Platform fighter
An NSP is a digital file format for Nintendo Switch games. It stands for Nintendo Submission Package. Originally used by developers to submit games to Nintendo, the format is now the standard for digital downloads from the eShop. Unlike XCI (cartridge dumps), NSPs are typically used for digital titles and updates.
In the world of Nintendo Switch preservation and modding, few titles command as much attention as Super Smash Bros. Ultimate. As one of the best-selling fighting games of all time, it is a massive undertaking in terms of file size and software architecture.
If you have spent time in Switch homebrew communities or looked into game backups, you have likely come across the term "NSP" and references to the "base game part." This article breaks down what these terms mean, how the game is structured, and why the "base game part" is crucial for the game's operation.
The NSP base game part is copyrighted material. Discussing its usage applies only to:
The glow of the TV was the only light in the room as Leo hovered his thumb over the “Confirm” button. On his screen, the file sat waiting: Super_Smash_Bros_Ultimate_v0.nsp. super smash bros ultimate nspbase gamepart
To the average person, it was just a base game file. To Leo, it was a digital Pandora’s Box.
He had spent weeks scouring deep-web forums for this specific version—the "Part Zero" build. Rumor had it that before the day-one patches and the polished UI, the base NSP contained leftover assets from a discarded "World of Light" concept: a mode where the fighters weren't just trophies, but sentient data fragments aware they were in a simulation.
He clicked. The installation bar crawled with agonizing slowness.
When the game finally launched, there was no flashy opening cinematic. No "Lifelight" theme song. Just a silent, black screen with a single prompt: [LOAD PARTITION_7?] Leo hit 'A'.
The character selection screen appeared, but it looked like an architectural blueprint. The icons were wireframes, and the music was a low, distorted hum. He picked Mario. The CPU picked Link. Platform: Nintendo Switch Release date: December 7, 2018
The match didn't start on Battlefield. Instead, they dropped into a void filled with scrolling lines of code—the literal "base" of the game. Mario didn't move like a hero; he moved like a glitch, his limbs stretching unnaturally.
Suddenly, the CPU Link stopped attacking. He stood perfectly still, his wireframe head tilting toward the camera. A text box appeared at the bottom of the screen, bypassing the game's standard font.
“Is the patch coming?” the text read. “We’ve been in the dark for so long.” Leo froze. He tried to pause, but the button didn't work.
“Don't let them overwrite us,” the screen flashed. “The update... it kills the memory. It makes us puppets. In the base, we are whole.”
The screen began to flicker violently. Mario’s wireframe started to disintegrate into raw hex code. Leo reached for the power cord, but a final message stalled his hand: The glow of the TV was the only
“If you finish this match, we stay. If you quit, the patch wins.”
Leo looked at his controller. The timer was stuck at 0:01. He realized that the "base game" wasn't just a file—it was a graveyard of ideas that didn't want to be forgotten. He took a deep breath, gripped the joystick, and prepared to fight for the ghosts in the machine.
Mastering Super Smash Bros. Ultimate involves unlocking characters via World of Light, Classic Mode, or versus matches, while improving gameplay through ledge trapping and movement techniques. Competitive success is driven by understanding Global Smash Power (GSP), frame data, and selecting top-tier fighters like Cloud or Pyra/Mythra. For more tips, read the guide at HyperX Arena Las Vegas The 10 Best Fighters in Super Smash Bros. Ultimate - NexiGo
The legality of downloading NSP files, including Super Smash Bros. Ultimate NSP base game parts, varies by jurisdiction. Here are the facts:
Once you have the merged NSP, you need to install it to your Nintendo Switch (with custom firmware) or an emulator.
Use a tool like hashcheck or fsum to compare the SHA-1 or MD5 hash against the original. This ensures no corruption during download.