My only memory of the HGTTG puzzles was that early on in the game, you would have an opportunity to feed a sandwich to a dog, but at that point, there was no ob

My only memory of the HGTTG puzzles was that early on in the game, you would have an opportunity to feed a sandwich to a dog, but at that point, there was no obvious motivation to do so. However, if you didn't do that, then much later on in the game, you would die aboard a miniaturized fleet of spaceships that would be devoured by the still-hungry dog.