The core rules of the game are distributed in a ZIP archive that contains four PDF files:
Threat Encounters Bonus Dice
Generally, these documents include what you would expect from their titles. The Rules document presents character creation and the dice pool mechanic. The game intriguingly collapses a character's performance dice pool with their health status--wounds remove dice from the active pool; healing restores them.
While the design goal of the game was provide a simple, easily-accessible system that sacrifices realism for playability, the actual dice pool mechanic is quite complex and has numerous special-case rules. The Threat Encounters Bonus Dice document provides an additional series of variants to the already complicated dice pool rules.