Hi, I got Unity engine game and its save but could not find any save editor anywhere
is it not possible?
Save files from Unity games totally depend, in their form and format, of what the author of the game want.
Some will be plain text, either following a basic tabulation syntax, XML, or JSON. Some will be pure binary dump, while others will be more advanced serialization. There no rules, not limitation, and therefore there's no "Unity save editors".