From the first page:
What is This?
You've played the computer RPG. Now try the world's greatest adventure game! This is the Dungeons & Dragons® game set in the dark, deadly world of Diablo II. It's an RPG experience without your computer.
This demo gives you the feel of playing the Dungeons & Dragons game, where you and your friends take on the roles of imaginary heroes right out of the Diablo II computer game—the Amazon, Barbarian, Paladin, and Sorcerer.
The full D&D® game contains all sorts of options to help you create your own Diablo II campaign. The back page of this Fast-Play Game has more information. Check it out after you've played this adventure.