diff --git a/Dolphin scripts/Entrance Randomizer/lib/constants.py b/Dolphin scripts/Entrance Randomizer/lib/constants.py
index 346dce4..0bc5af6 100644
--- a/Dolphin scripts/Entrance Randomizer/lib/constants.py	
+++ b/Dolphin scripts/Entrance Randomizer/lib/constants.py	
@@ -28,15 +28,15 @@
 print("Seed set to:", seed_string)
 
 
-@dataclass
+@dataclass(frozen=True)
 class Addresses:
     version_string: str
-    prev_area: list[int]
+    prev_area: tuple[int, ...]
     current_area: int
     area_load_state: int
-    player_x: list[int]
-    player_y: list[int]
-    player_z: list[int]
+    player_x: tuple[int, ...]
+    player_y: tuple[int, ...]
+    player_z: tuple[int, ...]
     item_swap: int
     shaman_shop_struct: int
 
@@ -44,12 +44,12 @@ class Addresses:
 TRANSITION_INFOS_DICT = {
     area.area_id: area for area in chain(*transition_infos)
 }
-ALL_TRANSITION_AREAS = {area.area_id for area in chain(*transition_infos)}
-ALL_POSSIBLE_TRANSITIONS = [
+ALL_TRANSITION_AREAS = frozenset(area.area_id for area in chain(*transition_infos))
+ALL_POSSIBLE_TRANSITIONS = tuple(
     (area.area_id, exit_.area_id)
     for area in TRANSITION_INFOS_DICT.values()
     for exit_ in area.exits
-]
+)
 
 
 _game_id_base = "".join([
@@ -75,45 +75,45 @@ class Addresses:
     "GPH": {
         "D": Addresses(
             version_string="GC DE 0-00",
-            prev_area=[0x80747648],
+            prev_area=(0x80747648,),
             current_area=0x80417F50,
             area_load_state=TODO,
-            player_x=[],
-            player_y=[],
-            player_z=[],
+            player_x=(),
+            player_y=(),
+            player_z=(),
             item_swap=0x804C7734,
             shaman_shop_struct=TODO,
         ),
         "E": Addresses(
             version_string="GC US 0-00",
-            prev_area=[0x8072B648],
+            prev_area=(0x8072B648,),
             current_area=0x8041BEB4,
             area_load_state=0x8041BEC8,
-            player_x=[0x8041BE4C, 0x338],
-            player_y=[0x8041BE4C, 0x33C],
-            player_z=[0x8041BE4C, 0x340],
+            player_x=(0x8041BE4C, 0x338),
+            player_y=(0x8041BE4C, 0x33C),
+            player_z=(0x8041BE4C, 0x340),
             item_swap=0x804CB694,
             shaman_shop_struct=0x7E00955C,
         ),
         "F": Addresses(
             version_string="GC FR 0-00",
-            prev_area=[0x80747648],
+            prev_area=(0x80747648,),
             current_area=0x80417F30,
             area_load_state=TODO,
-            player_x=[],
-            player_y=[],
-            player_z=[],
+            player_x=(),
+            player_y=(),
+            player_z=(),
             item_swap=0x804C7714,
             shaman_shop_struct=TODO,
         ),
         "P": Addresses(
             version_string="GC EU 0-00",
-            prev_area=[0x80747648],
+            prev_area=(0x80747648,),
             current_area=0x80417F10,
             area_load_state=TODO,
-            player_x=[],
-            player_y=[],
-            player_z=[],
+            player_x=(),
+            player_y=(),
+            player_z=(),
             item_swap=0x804C76F4,
             shaman_shop_struct=TODO,
         ),
@@ -121,23 +121,23 @@ class Addresses:
     "RPF": {
         "E": Addresses(
             version_string="Wii US 0-00",
-            prev_area=[0x804542DC, 0x8],
+            prev_area=(0x804542DC, 0x8),
             current_area=0x80448D04,
             area_load_state=TODO,
-            player_x=[],
-            player_y=[],
-            player_z=[],
+            player_x=(),
+            player_y=(),
+            player_z=(),
             item_swap=0x80446608,
             shaman_shop_struct=TODO,
         ),
         "P": Addresses(
             version_string="Wii EU 0-00",
-            prev_area=[0x804546DC, 0x18],
+            prev_area=(0x804546DC, 0x18),
             current_area=0x80449104,
             area_load_state=TODO,
-            player_x=[],
-            player_y=[],
-            player_z=[],
+            player_x=(),
+            player_y=(),
+            player_z=(),
             item_swap=0x80446A08,
             shaman_shop_struct=TODO,
         ),
diff --git a/Dolphin scripts/Entrance Randomizer/lib/transition_infos.py b/Dolphin scripts/Entrance Randomizer/lib/transition_infos.py
index b6676ca..e8d27f5 100644
--- a/Dolphin scripts/Entrance Randomizer/lib/transition_infos.py	
+++ b/Dolphin scripts/Entrance Randomizer/lib/transition_infos.py	
@@ -37,48 +37,48 @@ class AreaJSON(TypedDict):
     TransitionInfosJSON = None
 
 
-@dataclass
+@dataclass(frozen=True)
 class Exit:
     area_id: int
     area_name: str
     requires: None | list[list[str]]
 
 
-@dataclass
+@dataclass(frozen=True)
 class Area:
     area_id: int
     name: str
     default_entrance: int
-    exits: list[Exit]
+    exits: tuple[Exit, ...]
 
 
 class MajorAreas(NamedTuple):
-    jungle: list[Area]
-    native_territory: list[Area]
-    lost_caverns: list[Area]
-    snowy_mountains: list[Area]
+    jungle: tuple[Area, ...]
+    native_territory: tuple[Area, ...]
+    lost_caverns: tuple[Area, ...]
+    snowy_mountains: tuple[Area, ...]
 
 
 def major_areas_from_JSON(transition_infos_json: TransitionInfosJSON):  # noqa: N802
-    major_areas = [
-        [
+    major_areas = (
+        tuple(
             Area(
                 int(area["area_id"], 16),
                 area["area_name"],
                 int(area["default_entrance"] or "0x0", 16),
-                [
+                tuple(
                     Exit(
                         int(exit_["area_id"] or "0x0", 16),
                         exit_["area_name"],
                         exit_["requires"],
                     )
                     for exit_ in area["exits"]
-                ],
+                ),
             )
             for area in major_area
-        ]
+        )
         for major_area in transition_infos_json.values()
-    ]
+    )
     return MajorAreas(*major_areas)