diff --git a/CommonClient.py b/CommonClient.py
index b622fb93..51791100 100644
--- a/CommonClient.py
+++ b/CommonClient.py
@@ -196,25 +196,11 @@ class CommonContext:
             self.lookup_type: typing.Literal["item", "location"] = lookup_type
             self._unknown_item: typing.Callable[[int], str] = lambda key: f"Unknown {lookup_type} (ID: {key})"
             self._archipelago_lookup: typing.Dict[int, str] = {}
-            self._flat_store: typing.Dict[int, str] = Utils.KeyedDefaultDict(self._unknown_item)
             self._game_store: typing.Dict[str, typing.ChainMap[int, str]] = collections.defaultdict(
                 lambda: collections.ChainMap(self._archipelago_lookup, Utils.KeyedDefaultDict(self._unknown_item)))
-            self.warned: bool = False
 
         # noinspection PyTypeChecker
         def __getitem__(self, key: str) -> typing.Mapping[int, str]:
-            # TODO: In a future version (0.6.0?) this should be simplified by removing implicit id lookups support.
-            if isinstance(key, int):
-                if not self.warned:
-                    # Use warnings instead of logger to avoid deprecation message from appearing on user side.
-                    self.warned = True
-                    warnings.warn(f"Implicit name lookup by id only is deprecated and only supported to maintain "
-                                  f"backwards compatibility for now. If multiple games share the same id for a "
-                                  f"{self.lookup_type}, name could be incorrect. Please use "
-                                  f"`{self.lookup_type}_names.lookup_in_game()` or "
-                                  f"`{self.lookup_type}_names.lookup_in_slot()` instead.")
-                return self._flat_store[key]  # type: ignore
-
             return self._game_store[key]
 
         def __len__(self) -> int:
@@ -254,7 +240,6 @@ class CommonContext:
             id_to_name_lookup_table = Utils.KeyedDefaultDict(self._unknown_item)
             id_to_name_lookup_table.update({code: name for name, code in name_to_id_lookup_table.items()})
             self._game_store[game] = collections.ChainMap(self._archipelago_lookup, id_to_name_lookup_table)
-            self._flat_store.update(id_to_name_lookup_table)  # Only needed for legacy lookup method.
             if game == "Archipelago":
                 # Keep track of the Archipelago data package separately so if it gets updated in a custom datapackage,
                 # it updates in all chain maps automatically.
diff --git a/test/programs/test_common_client.py b/test/programs/test_common_client.py
index 9936240d..eeeba9d4 100644
--- a/test/programs/test_common_client.py
+++ b/test/programs/test_common_client.py
@@ -47,17 +47,6 @@ class TestCommonContext(unittest.IsolatedAsyncioTestCase):
         assert "Archipelago" in self.ctx.item_names, "Archipelago item names entry does not exist"
         assert "Archipelago" in self.ctx.location_names, "Archipelago location names entry does not exist"
 
-    async def test_implicit_name_lookups(self):
-        # Items
-        assert self.ctx.item_names[2**54 + 1] == "Test Item 1 - Safe"
-        assert self.ctx.item_names[2**54 + 3] == f"Unknown item (ID: {2**54+3})"
-        assert self.ctx.item_names[-1] == "Nothing"
-
-        # Locations
-        assert self.ctx.location_names[2**54 + 1] == "Test Location 1 - Safe"
-        assert self.ctx.location_names[2**54 + 3] == f"Unknown location (ID: {2**54+3})"
-        assert self.ctx.location_names[-1] == "Cheat Console"
-
     async def test_explicit_name_lookups(self):
         # Items
         assert self.ctx.item_names["__TestGame1"][2**54+1] == "Test Item 1 - Safe"