Procedural generation is a process that allows games to create environments like levels or worlds on the fly by following a script or formula. Procedural generation ensures that every play of Dwarf Fortress and Spelunky is a unique experience, at same time saving developers from the need to hand-craft levels.
How to Host a Dungeon is a solo game in which you follow a script sketching and narrating a procedurally generated dungeon. You use random number generators (dice) to determine what happens to various groups that come to explore, expand (dig), exploit (mine), or exterminate.
The game is divided into four eras: Primordial, Civilization, Monsters, and Villainy.
In the Primordial Age, you throw dice on a piece of paper. Where the dice fall determines the location, and the value shown determines what it is -- mithral deposit, underground river, gold vein, and more. Next, during the Age of Civilization, a group, usually of dwarves, comes seeking for precious metals, and in the process dig many new rooms. After the precious metals run out, the civilized groups move out and the Age of Monsters begins. In the Age of Monsters, several groups of monsters and humans roam and settle in the various abandoned rooms of the dungeon. They soon crowd each other, and conflict ensues. Many perish, and some groups will be exterminated. Finally all the ruckus attracts a high level monster, such as a lich king, who enslaves all dungeon inhabitants as his minions.
How to Host a Dungeon technically is not a game, rather a leisure activity because it lacks meaningful choices. However it sure plays like one because it is entertaining to sketch the dungeon expansion and see how the inhabitants interact with each other. If you enjoy doodling, or storytelling, this will be perfect for you.
Tony Dowler, the designer, offers How to Host a Dungeon as a PDF for $5.00 and a deluxe print set for $19.00. There is also a free PDF with fewer options and without illustrations. The illustrations add inspiration for your dungeon and definitely worth the money.