You must install a homebrew save manager on your Switch. The two most reliable and widely used tools are:

Before diving into how to import a save file, it's crucial to understand how the Nintendo Switch manages save data — because this is where most would-be users run into problems.

In a game as massive as Ultimate , reaching 100% completion is a Herculean task. Unlike previous entries, "completion" is defined by several grueling milestones:

Do you need a on how to unlock characters fast without mods?

The save manager will allow you to:

A: Possibly, but version mismatches are common. Many users report that save injection simply resets progress to zero when the versions don't match. Always verify compatibility before attempting.

A 100% save file for Super Smash Bros. Ultimate exists and is shared within modding communities — but using it requires a hacked Switch and carries significant risk of permanent Nintendo account bans. The detection systems are real, Smash Ultimate's internal logging is comprehensive, and Nintendo has demonstrated willingness to take action against modified save files.

When downloading any file from these sources, exercise caution. Malware and fake downloads are common risks.

Right-click Super Smash Bros. Ultimate in your Yuzu game list. Open Save Location: Select "Open Save Data Location."

Every base game character and Mii Fighter type unlocked.

A Nintendo Switch console capable of running custom firmware (CFW) like Atmosphere.

A verified System Data file downloaded from a trusted community source matching your game's region (USA, EUR, or JPN). Step-by-Step Installation Guide via JKSV:

I can provide specific file structures or links based on your setup. Share public link

This comprehensive guide explains what a 100% save file includes, how to safely install it on your Nintendo Switch, and how to troubleshoot common issues. What a 100% Save File Includes