diff --git a/worlds/generic/Rules.py b/worlds/generic/Rules.py
index cc07d491..ed9b5542 100644
--- a/worlds/generic/Rules.py
+++ b/worlds/generic/Rules.py
@@ -1,4 +1,16 @@
-def locality_rules(world, player):
+import typing
+
+if typing.TYPE_CHECKING:
+    import BaseClasses
+
+    CollectionRule = typing.Callable[[BaseClasses.CollectionState], bool]
+    ItemRule = typing.Callable[[BaseClasses.Item], bool]
+else:
+    CollectionRule = typing.Callable[[object], bool]
+    ItemRule = typing.Callable[[object], bool]
+
+
+def locality_rules(world, player: int):
     if world.local_items[player].value:
         for location in world.get_locations():
             if location.player != player:
@@ -9,18 +21,18 @@ def locality_rules(world, player):
                 forbid_items_for_player(location, world.non_local_items[player].value, player)
 
 
-def exclusion_rules(world, player: int, exclude_locations: set):
+def exclusion_rules(world, player: int, exclude_locations: typing.Set[str]):
     for loc_name in exclude_locations:
         location = world.get_location(loc_name, player)
         add_item_rule(location, lambda i: not (i.advancement or i.never_exclude))
         location.excluded = True
 
 
-def set_rule(spot, rule):
+def set_rule(spot, rule: CollectionRule):
     spot.access_rule = rule
 
 
-def add_rule(spot, rule, combine='and'):
+def add_rule(spot, rule: CollectionRule, combine='and'):
     old_rule = spot.access_rule
     if combine == 'or':
         spot.access_rule = lambda state: rule(state) or old_rule(state)
@@ -28,36 +40,36 @@ def add_rule(spot, rule, combine='and'):
         spot.access_rule = lambda state: rule(state) and old_rule(state)
 
 
-def forbid_item(location, item, player: int):
+def forbid_item(location, item: str, player: int):
     old_rule = location.item_rule
     location.item_rule = lambda i: (i.name != item or i.player != player) and old_rule(i)
 
 
-def forbid_items_for_player(location, items: set, player: int):
+def forbid_items_for_player(location, items: typing.Set[str], player: int):
     old_rule = location.item_rule
     location.item_rule = lambda i: (i.player != player or i.name not in items) and old_rule(i)
 
 
-def forbid_items(location, items: set):
+def forbid_items(location, items: typing.Set[str]):
     """unused, but kept as a debugging tool."""
     old_rule = location.item_rule
     location.item_rule = lambda i: i.name not in items and old_rule(i)
 
 
-def add_item_rule(location, rule):
+def add_item_rule(location, rule: ItemRule):
     old_rule = location.item_rule
     location.item_rule = lambda item: rule(item) and old_rule(item)
 
 
-def item_in_locations(state, item, player, locations):
+def item_in_locations(state, item: str, player: int, locations: typing.Sequence):
     for location in locations:
         if item_name(state, location[0], location[1]) == (item, player):
             return True
     return False
 
 
-def item_name(state, location, player):
+def item_name(state, location: str, player: int) -> typing.Optional[typing.Tuple[str, int]]:
     location = state.world.get_location(location, player)
     if location.item is None:
         return None
-    return (location.item.name, location.item.player)
\ No newline at end of file
+    return location.item.name, location.item.player