Though the first official expansion for Neverwinter Nights, Shadows of Undrentide, was a solid effort and a good deal of fun, it lacked any real challenge and seemed a bit by-the-book and predictable. With the second expansion, Hordes of the Underdark, Bioware addresses those issues with a simple change of setting. The world of the Underdark, with its foul beasts and the cunning Drow, is fascinating. Bioware even added a few new tile-sets for the dungeons, giving the game a bit different look from its predecessors. Add to those improvements a few new prestige classes and some intriguing puzzles and players are left with a fun game that is worth the slightly higher than normal expansion asking price.