: .rar is a compressed archive. Inside, you will typically find a .nsp file (Nintendo Submission Package), which is a digital format for Switch games.
To use them, you must download into the same folder. BIG-RUMBLE-BOXING-CREED-CHAMPIONS-NSP-ROMSLAB.rar
: If you are seeing "piece" or "part1, part2, etc." in the download name, it means the large game file (approximately 3.8 GB ) has been split into smaller segments to make downloading easier. : If you are seeing "piece" or "part1, part2, etc
: Big Rumble Boxing: Creed Champions is an arcade-style boxing game featuring characters from the Rocky and Creed film franchises, including Rocky Balboa, Adonis Creed, and Ivan Drago. etc." in the download name
Open the first piece (usually ending in .part1.rar or .001 ) with a program like or 7-Zip , and it will automatically combine them into a single usable file.