During my testing, the Slime Rancher 2 Save Editor performed smoothly, with no major issues or crashes. I was able to edit my save files without any problems, and the changes took effect immediately in-game.

: Spawn rare slimes, plorts, and crafting components directly into your vacpack slots.

If you don’t trust third-party apps, you can edit the raw save file with any text editor (like Notepad++ or VS Code).