diff --git a/core/scene.jai b/core/scene.jai
index ef8a64e..134c232 100644
--- a/core/scene.jai
+++ b/core/scene.jai
@@ -6,6 +6,7 @@
 #placeholder delete_entity;
 #placeholder serialize_entity;
 #placeholder deserialize_entity;
+#placeholder duplicate_entity;
 
 MAX_CACHED_PILES :: 8;
 last_unnamed_scene_id := 0;
diff --git a/editor/editor_ui.jai b/editor/editor_ui.jai
index d28aebd..19630eb 100644
--- a/editor/editor_ui.jai
+++ b/editor/editor_ui.jai
@@ -264,30 +264,23 @@ base_editor_update :: () {
 
             engine.editor.selected_entities.count = 0;
         }
+
+        if key_pressed(.CTRL) && key_down(.D) {
+            duplicated_entities: [..] *Entity;
+            duplicated_entities.allocator = temp;
+
+            for e: engine.editor.selected_entities {
+                array_add(*duplicated_entities, duplicate_entity(e));
+            }
+
+            engine.editor.selected_entities.count = 0;
+
+            for e: duplicated_entities {
+                array_add(*engine.editor.selected_entities, e);
+            }
+        }
     }
 
-    //if entity != null {
-    //    // @Incomplete:@Incomplete:  Duplicate
-    //    //if key_pressed(.CTRL) && key_down(.D) {
-    //    //    make_directory_if_it_does_not_exist("../temp");
-    //    //    save_entity(entity, "../temp/", "temp");
-    //    //    duplicated := load_entity(editor_scene, "../temp/temp.ent");
-    //    //    entity = duplicated;
-    //    //}
-
-    //    // DELETE
-    //    // DELETE
-    //    //if key_down(.DELETE) || key_down(.BACKSPACE) {
-    //    //    delete_entity(entity);
-    //    //    entity = null;
-    //    //    editor.transform_gizmo.selected_axis = .NONE;
-    //    //}
-    //}
-
-    //if key_pressed(.CTRL) && key_down(.Z) {
-    //    editor_undo();
-    //}
-
     if engine.mode == .EDITING {
         if key_pressed(.MOUSE_RIGHT) {
             set_show_cursor(false);
diff --git a/metaprogram.jai b/metaprogram.jai
index 8f1fbba..986ec94 100644
--- a/metaprogram.jai
+++ b/metaprogram.jai
@@ -132,6 +132,32 @@ generate_member_deserialization :: (type: *Type_Info_Struct, builder: *String_Bu
     }
 }
 
+generate_member_copy :: (type: *Type_Info_Struct, builder: *String_Builder, path: string = "") {
+    for type.members {
+        if should_serialize(type, it) {
+            new_path : string;
+            if path.count == 0 {
+                new_path = it.name;
+            } else {
+                new_path = tprint("%1.%2", path, it.name);
+            }
+
+            if it.type.type == {
+                case .STRUCT; {
+                    info_struct := cast(*Type_Info_Struct) it.type;
+                    generate_member_copy(info_struct, builder, new_path);
+                }
+                case .BOOL; #through;
+                case .FLOAT; #through;
+                case .ENUM; #through;
+                case .INTEGER; {
+                    print_to_builder(builder, "\tcopy.% = e.%;\n", new_path, new_path);
+                }
+            }
+        }
+    }
+}
+
 generate_serialize_procedure_for_entity :: (code_struct: *Code_Struct) {
     name := code_struct.defined_type.name;
 
@@ -162,6 +188,18 @@ generate_serialize_procedure_for_entity :: (code_struct: *Code_Struct) {
 
     print_to_builder(*deserialize, "}\n");
     array_add(*entity_serialize_proc_string, builder_to_string(*deserialize));
+
+    // Duplicate
+    duplicate : String_Builder;
+    print_to_builder(*duplicate, "duplicate_entity :: (e: *%) -> *% {\n", name, name);
+    print_to_builder(*duplicate, "\tcopy := new_%();\n", to_lower_copy_new(name,,allocator=temp));
+
+    generate_member_copy(code_struct.defined_type, *duplicate);
+
+    print_to_builder(*duplicate, "\treturn copy;\n");
+    print_to_builder(*duplicate, "}\n");
+
+    array_add(*entity_serialize_proc_string, builder_to_string(*duplicate));
 }
 
 note_struct :: (code_struct: *Code_Struct) {
@@ -280,6 +318,17 @@ generate_code :: (w: Workspace) {
         add_build_string(build_string, w);
     }
 
+    {
+        builder: String_Builder;
+
+        for entity_type_names {
+            print_to_builder(*builder, "\tcase %1; return duplicate_entity(cast(*%1)e);\n", it);
+        }
+        
+        build_string := sprint(DUPLICATE_ENTITY, builder_to_string(*builder));
+        add_build_string(build_string, w);
+    }
+
     {
         builder: String_Builder;
 
@@ -384,6 +433,16 @@ deserialize_entity :: (scene: *Scene, id: Entity_Id, path: string) -> *Entity {
 
     return e;
 }
+
+DONE
+DUPLICATE_ENTITY :: #string DONE
+duplicate_entity :: (e: *Entity) -> *Entity {
+    if e.type == {
+        %1
+    }
+
+    return e;
+}
 DONE
 
 INIT_SCENE :: #string DONE