free will == the will to change reality (3137, יָחִיד)
true free will == understanding (3, בִּינָה)
When the player ultimately understands how the game is designed, the player becomes fluent in the language in which Reality is written. The player can now redesign everything. True free will is attained.
While the player maintains purity, they won't provoke ego-based damage (i.e., they are free from the wheel of fortune / karma laws), and won't lose their powers (or themselves).