The game is a very stripped down, single player version of Dungeons and Dragons. A player chooses a pre-set character class, names their character, and chooses an adventure to run through. The computer does the rest; the computer does all the "dice" rolling and all the game-mastering. All a player needs to do is to check in every once in a while to see how each encounter has ended and to equip their character with new potions and equipment as the character gains experience and levels.
Having said all that, it is surprisingly addictive. When I first tried the game I was a little skeptical as to whether such a passive game could be engaging. I quickly found, though, that having something to check on throughout the day, having something to read and even just a few decisions to make had me clicking back through Facebook to the D&D: TA app more than I ever would have thought possible.
Of course, as a result, I have been spending a lot more time inside Facebook, but that is a topic for another day. In the meantime, if you're a fan of Dungeons & Dragons, or of Facebook, or have just tried either one, give D&D: TA a chance. You may be surprised how much you like it.