Nosferatu: The Wrath of Malachi

Nosferatu: The Wrath of Malachi is a shock-style horror first person shooter game. The player's starting weapons are his fists and a trusty cane sword, though firearms and other weapons become available later in the game. The objective of the game is to search the castle and save members of the protagonist's family within a one and a half hour time limit. These relatives will die if not rescued soon enough so the player has to hurry. The castle's interiors are randomly generated at the beginning of a new game.

Source: Wikipedia, "Nosferatu: The Wrath of Malachi", available under the CC-BY-SA License.