Last year's Neverwinter Nights was BioWare's ambitious attempt to capture the open-ended nature of pen-and-paper Dungeons & Dragons on the PC. While the game's lengthy single-player campaign was hardly an afterthought, Neverwinter Nights' 3D engine and toolset got a lot of attention, because they were intended to allow fans to create and host their very own D&D adventures. Indeed, now there are countless free fan-made Neverwinter Nights modules available for download, but as you'd expect, their quality and size can vary wildly. Meanwhile, the first retail expansion pack for Neverwinter Nights offers much the same level of quality that fans have come to expect from BioWare's role-playing games over the years. While Shadows of Undrentide doesn't fix the shortcomings of Neverwinter Nights' Aurora engine (which isn't aging as well as BioWare's Infinity engine, which was used for five years' worth of great RPGs), this expansion features a good-sized original campaign and makes a few noteworthy additions to the gameplay of the original.