Your reward from the wizard: a magic low-carb donut
You have now written a complete text adventure game!
You can view a complete walk-through of the game, since every game needs a cheater's guide! You can also view the complete source code, and you can load it directly into Emacs with the command (load "/path/to/wizard-adventure-emacs.el") in a single step.
Full Disclosure: In order to make this tutorial as simple as possible, many details about how Lisp works have been glossed or fudged over, so let's look at what those details are...
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