Mewgenics Patcher

Mewgenics! Patcher — Save Editor (Stats + Abilities)

A noob-friendly patcher for Mewgenics saves. Backups included. Bad passives deleted properly.

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What this mod is

This is a small Python-based save patcher / save editor for Mewgenics that lets you:

• []List your active in-house cats (the ones actually placed in rooms + are on adventures)

  []Edit base stats (STR / DEX / CON / INT / SPD / CHA / LUCK)

  []Delete or replace mutations

  []Edit cat ages / delete 'Retired' flag

  []Delete or replace abilities/passives safely (fixes things like BloodFrenzy without corrupting the save)

  []Automatically backs up your save before touching anything

It is designed for people who don’t want to hex edit blobs or gamble with half-broken save editors.

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Key features

✅ Noob-friendly interactive wizard

Run one command, pick your save, pick your cat, pick what you want to modify.

✅ Works on Linux (Proton) and Windows

The script tries to auto-detect the default save folder paths for:

• []Linux Proton Steam

  []Linux Flatpak Steam

  []Windows AppData / Roaming

You can also point it to a specific save file manually if detection fails.

✅ Automatic backup

Before any patching happens, it creates a backup like:

• []steamcampaign01.sav → steamcampaign01_mewgenics_patcher.savbak

So if you break your save, you can undo it.

✅ Safe “delete passive” method

Other save patchers “delete” an ability by replacing the string withNoneor blanking bytes. That can cause:

• []NO PASSIVE NAMED None

  []out of bounds

  []white screen battles

  []crashes / corrupted blobs

  This patcher removes passives correctly by rewriting the length-prefixed ability record and repacking it so the blob remains structurally valid.

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  What you can edit right now

  1) Base Stats

  You’ll see the current base stats and can set them directly:

  Example input:

  7 7 7 7 7 7 7

  2) Abilities / Passives

  The script will list ability/string records found for the chosen cat. You can:

  • []Delete an ability/passive

    []Replace it with another internal ability id ex: TakeAim

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  What this does NOT do (yet)

  • []It doesn’t handle every possible save field.

    []It currently targets cats detected as “active in house”. If parsing fails, it can fall back to listing all cats.

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  Requirements

  • []Python 3. 10+ recommended

    []Python dependency:

  Install:
  • []Windows:

    py -m pip install lz4 rich

    []Linux:

    pip install lz4 rich

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  How to use

  Basic usage

  python mewgenics_patcher.py --scan --verify

  • []--scan - starts the interactive wizard

    []--verify  - runs sanity checks after patching (recommended)

  If auto-detection doesn’t find your saves

  Point it to a save manually:

  python mewgenics_patcher.py --scan --sav /path/to/steamcampaign01.sav --verify

  What happens when you run it

  • []It finds your saves and asks which one to use

    []It creates a backup (.savbak)

    []It lists your in-house cats (name/sex/stats)

    []You pick which cat(s) to edit

    []You edit stats or abilities

    []It patches the original save in-place

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  Troubleshooting

  “It can’t find my save files”

  and point it directly at your steamcampaign0X.sav

  “Ability list contains weird entries”

  The script currently scans a common string-record pattern in the blob. It’s good enough to patch real abilities, but it may show some unrelated internal strings. If you’re unsure, don’t patch it.

  “Game crashes after patching”

  Restore the backup:

  • rename steamcampaign01_mewgenics_patcher.savbak back to steamcampaign01.sav

    If you can reproduce it, post: