Since the .sav file is just JSON, open both files in Notepad++. Copy the "UnlockedFish" array from File A and paste it over File B's array. Save. You now have a hybrid save. Just ensure you don't duplicate brackets { } or commas, or the JSON will break. The Feed and Grow Fish save file is more than just a cheat; it is a tool. Whether you are recovering a lost childhood save, skipping a tedious grind, or learning how game data structures work, editing your save is a rite of passage for dedicated players.

Feed and Grow Fish has carved out a unique niche in the indie gaming world. It is a beautiful, brutal, and surprisingly addictive simulation where you start as a tiny fish in a massive ecosystem. You eat to grow, and you grow to eat bigger things. But let’s be honest: the grind is real. Dying as a level 1 Vlamingii after being swallowed by a King of the Salmon for the tenth time can test anyone’s patience.

Feed and Grow Fish updates frequently (adding the Lionfish, the Giant Squid, etc.). A save file from version 1.2 might crash version 1.5. If your game crashes on load, your save file is too old. You need to start a fresh save or edit manually.

This is where the elusive comes into play.

Note: The AppData folder is hidden by default in Windows.

Notepad++ (standard Notepad works, but formatting is ugly).

You edited the file but forgot to close the game first. The game loaded the save into RAM, you changed the hard drive file, then the game saved over your file when you quit. Always edit while the game is closed.