This is not the full game, but the software update released by Nintendo in April 2019. It added the VR Mode compatible with the Nintendo Labo VR Kit and fixed several gameplay bugs.
The file is compressed to reduce its size for downloading; you would need a tool like WinRAR or 7-Zip to extract the .nsp file inside. Version 1.3.0 Key Features
This specific file is distributed via third-party ROM sites like and is intended for use with custom firmware or emulators. What is in this file?
Installing the update on a Nintendo Switch running custom firmware (CFW) to bypass the official eShop .
The file is a compressed archive containing a digital update (v1.3.0) for the Nintendo Switch game Super Mario Odyssey .
Downloading files from third-party ROM sites carries significant risks, including malware and potential legal issues regarding copyright. Always ensure your system is protected and be aware that "ROMSLAB" is an unofficial distribution source.
Using software like Yuzu or Ryujinx on a PC to play the game with the latest official patches.