Replace the old file with your new, overpowered version.

Similar to JSON, often used for legacy save systems or configuration files. (.dat / .save) SaveEditOnline.com

Browser + optional native helper

Sort of, but not in the way you might think.

For developers, Unity offers "online" solutions for managing game data that players can access across devices.

Unity Save Editor Online typically refers to browser-based tools designed to modify save files (