Installing unofficial NSP files requires a modified Nintendo Switch running Custom Firmware (CFW). Connecting a modified console to Nintendo’s official servers with illegally obtained NSP files installed almost always results in a permanent hardware ban from Nintendo Network services.

"Man, it was a crazy experience," 3rar recalled. "I was invited to a private tournament with a handful of other gamers. We were told to play a special version of Mario Tennis Aces, with custom rules and courts. It was like nothing I'd ever seen before. The courts were insane – like, who puts a warp pipe in the middle of a tennis court?"