Dark Dungeons X (d20)
Dark Dungeons¸ the retro-roleplaying game in the style of old-school 1980's and 1990's role-playing when rogues were thieves¸ races were classes¸ and you could start your adventuring careed exploring a few basic dungeons and end up travelling the planes as a being of pure divine power is back for a tenth anniversary edition!
This new edition is the entire game in a single book¸ so there is no need to cross- reference between multiple rule books and supplements¸ and it contains all the rules from both Dark Dungeons and Darker Dungeons¸ as well as extensive developer commentary explaining which rules were kept from the source material and which were changed (and why).