diff --git a/worlds/AutoWorld.py b/worlds/AutoWorld.py
index 11fca3a5..09943f23 100644
--- a/worlds/AutoWorld.py
+++ b/worlds/AutoWorld.py
@@ -78,7 +78,10 @@ class World(metaclass=AutoWorldRegister):
     # maps item group names to sets of items. Example: "Weapons" -> {"Sword", "Bow"}
     item_name_groups: Dict[str, Set[str]] = {}
 
-    data_version = 1  # increment this every time something in your world's names/id mappings changes.
+    # increment this every time something in your world's names/id mappings changes.
+    # While this is set to 0 in *any* AutoWorld, the entire DataPackage is considered in testing mode and will be
+    # retrieved by clients on every connection.
+    data_version = 1
 
     hint_blacklist: Set[str] = frozenset()  # any names that should not be hintable
 
diff --git a/worlds/__init__.py b/worlds/__init__.py
index 0f2a1e28..ed48e32e 100644
--- a/worlds/__init__.py
+++ b/worlds/__init__.py
@@ -34,3 +34,7 @@ network_data_package = {
     "version": sum(world.data_version for world in AutoWorldRegister.world_types.values()),
     "games": games,
 }
+
+# Set entire datapackage to version 0 if any of them are set to 0
+if any(not world.data_version for world in AutoWorldRegister.world_types.values()):
+    network_data_package["version"] = 0