Cause: The save file is encrypted, compressed (zlib), or uses a custom Tyrano plugin. Fix: This game has custom anti-cheat or obfuscation. For 95% of Steam visual novels, this doesn't happen. If it does, you need to contact the developer or use a memory editor (Cheat Engine) instead.
Not all variables are simple numbers. Some games store inventory as an array. For example: tyrano save editor
"inventory": ["potion", "leather_armor", "rusty_key"]
To add an "elixir":
"inventory": ["potion", "leather_armor", "rusty_key", "elixir"]
Note on order: Tyrano reads arrays sequentially. Adding an item to the end is safest. Removing an item requires stripping the exact string. Cause: The save file is encrypted, compressed (zlib),
Click "Encode & Download." The tool will minify the JSON and re-apply Base64 encoding. Save the file as save01.dat. Note on order: Tyrano reads arrays sequentially