One of the first things you'll notice in Linley's Dungeon Crawl is the large number of playable races and classes. You can play as a human, elf, dwarf, troll, orc, or ogre, among others. Each race also has a series of special classes. For example, the trolls can be either warriors or berserkers.
Linley's Dungeon Crawl is exactly what you'd expect from a game of this style: randomly generated settings, permadeath, and turn-based combat, all of which make for an extremely unforgiving game. All of this is behind a rather complicated interface that might take a bit of patience to learn if you're new to the genre.
Linley's Dungeon Crawl is a great traditional roguelike that can offer a real adventure for anyone looking for a different challenge than what most games offer these days.