public void save() {
		if (ChristmasCrashers.isDebugModeEnabled())
			System.out.println("Saving world " + ID + ".");
		if (!containsLoadedLevels()) {
			if (ChristmasCrashers.isDebugModeEnabled())
				System.out.println("Aborting save operation for world "  + ID + " - world does not contain any loaded levels.");
			return;
		}
		for (Level l : levels)
			if (l != null)
				l.save();
	}