Here's the secret.
It's a book. A real, print copy of the story you just told: one you can flip through and dog-ear and put on your shelf.
So, why the code? Because, of the many tales you could've told, you chose this one. There are other codes for other stories, and maybe you'll want to tell those, too. But right now, this is yours. You can own it as a hardcover, fully illustrated storybook, shipping later this fall. Or, if you choose, you can enter a different tale's code.
Well met, traveler.