diff --git a/src/game.rs b/src/game.rs
index 06d8226..757bd33 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -356,18 +356,18 @@ impl Game {
         // then handle the sections one by one
 
         // a room has a palette, so handle palettes before rooms
-        for palette in game.palettes {
+        for palette in &game.palettes {
             let new_id = self.add_palette(palette.clone());
             insert_if_different(palette_id_changes.borrow_mut(), palette.id.clone(),new_id);
         }
 
         // a room has tiles, so handle before room
-        for tile in game.tiles {
+        for tile in &game.tiles {
             let new_id = self.add_tile(tile.clone());
             insert_if_different(tile_id_changes.borrow_mut(), tile.id.clone(), new_id);
         }
 
-        for variable in game.variables {
+        for variable in &game.variables {
             // don't change ID - just avoid duplicates
             if ! self.variable_ids().contains(&variable.id) {
                 self.add_variable(variable.clone());
@@ -382,7 +382,7 @@ impl Game {
 
         // a sprite has a dialogue, so handle before sprites
         // dialogue can have variables, so handle before after variables
-        for dialogue in game.dialogues {
+        for dialogue in &game.dialogues {
             let mut dialogue = dialogue.clone();
 
             for (old, new) in &item_id_changes {
@@ -399,7 +399,7 @@ impl Game {
         }
 
         // an ending lives in a room, so handle endings before rooms
-        for ending in game.endings {
+        for ending in &game.endings {
             let new_id = self.add_ending(ending.clone());
             insert_if_different(ending_id_changes.borrow_mut(), ending.id.clone(), new_id);
         }
@@ -489,7 +489,7 @@ impl Game {
 
         // a sprite has a dialogue ID, so we need to handle these after dialogues
         // a sprite has a position in a room, so we need to handle these after the rooms
-        for sprite in game.sprites {
+        for sprite in &game.sprites {
             let mut sprite = sprite.clone();
             // avoid having two avatars
             if sprite.id == "A".to_string() {