diff --git a/BaseClasses.py b/BaseClasses.py
index cf0cf6d0..42ccb07d 100644
--- a/BaseClasses.py
+++ b/BaseClasses.py
@@ -212,6 +212,8 @@ class MultiWorld():
         for player in self.player_ids:
             for item_link in self.item_links[player].value:
                 if item_link["name"] in item_links:
+                    if item_link["game"] != self.game[player]:
+                        raise Exception(f"Cannot ItemLink across games. Link: {item_link['name']}")
                     item_links[item_link["name"]]["players"][player] = item_link["replacement_item"]
                     item_links[item_link["name"]]["item_pool"] &= set(item_link["item_pool"])
                 else: