This is a simple tweak adding a mirror connection between the main Light World and the Hyrule Castle Courtyard. This will very rarely come into play; it only matters in circumstances where the uncle tunnel does not instantly connect to the courtyard (some madness/insanity situations and when Ganon's tunnel is there in full and below), when the player does not have access to the upper levels of Hyrule Castle or to the pyramid, but the player does have the Mirror. This correctly acknowledges that entering the castle main gate is fully and permanently softlock proof in this situation.
-From KevinCathcart, this adds a new region to the world for the castle courtyard reachable from the exit to the uncle tunnel and from the upper ledge of Hyrule Castle but not the main gate. In effect, this changes nothing if Ganon is not at the uncle passage, and if Ganon is at the uncle passage, either Mirror + pyramid access, Master Sword, or a connecting cave to the upper ledge of Hyrule Castle will be required to access the main gate. This is necessary to fix a very rare softlock in which the player could defeat Agahnim, lose access to the Hyrule Castle main gate, and make the seed impossible.
This is the Great renaming. Renaming to match V27. I've renamed pretty
much all Item locations to match, with a small number kept deliberatly
deferent for clarity.
There is probably more renaming that should be done at the Enterance and
Region levels, but that can be done later.
Kevin Cathcart
AmazingAmpharos
LLCoolDave