diff --git a/src/game/engine/src/modules/climate/lens_unlock_manager.gd b/src/game/engine/src/modules/climate/lens_unlock_manager.gd
index 07ee5c5d..d4bdd28c 100644
--- a/src/game/engine/src/modules/climate/lens_unlock_manager.gd
+++ b/src/game/engine/src/modules/climate/lens_unlock_manager.gd
@@ -30,18 +30,23 @@ func _build_maps_from_lens_data() -> void:
 		)
 		return
 
+	# Sort so `unlock_lens` is called in a reproducible order across runs.
+	var file_names: Array[String] = []
 	dir.list_dir_begin()
 	var file_name: String = dir.get_next()
 	while file_name != "":
 		if file_name.ends_with(".json"):
-			var path: String = LENS_DIR + "/" + file_name
-			var lenses: Array = _load_lens_file(path)
-			for i: int in range(lenses.size()):
-				var lens: Dictionary = lenses[i] as Dictionary
-				if lens != null:
-					_process_lens(lens)
+			file_names.append(file_name)
 		file_name = dir.get_next()
 	dir.list_dir_end()
+	file_names.sort()
+	for sorted_name: String in file_names:
+		var path: String = LENS_DIR + "/" + sorted_name
+		var lenses: Array = _load_lens_file(path)
+		for i: int in range(lenses.size()):
+			var lens: Dictionary = lenses[i] as Dictionary
+			if lens != null:
+				_process_lens(lens)
 
 
 func _load_lens_file(path: String) -> Array: