Where Are Nubby's Number Factory Save Files Located?
Nubby saves on Windows and Steam Deck, where GameMaker puts NNF files and how to fix crash loops.
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Nubby's Number Factory (Steam AppID 3191030) uses GameMaker, so saves sit in LocalAppData under NNF_FULLVERSION. Expect NUBBY_AutoSave_F plus slot files. Steam Cloud mirrors the folder.
Crash on start usually means a corrupt autosave rather than a lost run. Removing that one file often revives the rest. Mobile releases exist separately and do not read these desktop files.
Where Nubby's Number Factory stores this, by platform
%LOCALAPPDATA%\NNF_FULLVERSION
Paste %LOCALAPPDATA%\NNF_FULLVERSION into Explorer. Back up before deleting anything. Turn off Steam Cloud while repairing or it restores the broken file.
~/.steam/steam/steamapps/compatdata/3191030/pfx/drive_c/users/steamuser/AppData/Local/NNF_FULLVERSION
Proton prefix for AppID 3191030. The drive_c side mirrors Windows LocalAppData. Use this when the Deck shows no local saves in the usual spot.
Frequently asked questions
How do I back up Nubby saves?
Close the game, copy the whole NNF_FULLVERSION folder elsewhere with a date. If the game crash loops on launch, delete only NUBBY_AutoSave_F.save and keep the rest. Disable Cloud before editing.
Can I move Nubby saves to Steam Deck?
Copy NNF_FULLVERSION into the Proton prefix path above with the game closed. Mobile builds from April 2026 sync separately through store accounts, so desktop files do not carry to phones.
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