The GURPS Cyberpunk sourcebook is legendary, famously having its offices raided by the U.S. Secret Service in 1990 because the rules for hacking were deemed "too realistic". While originally written for the 3rd Edition (now called "Classic"), it remains a definitive guide for building high-tech, low-life campaigns. 🛡️ The "Dangerous" Content

Here is the short version: The US Secret Service was investigating a hacker collective called the "Legion of Doom." One member had a file on his computer named "GURPS Cyberpunk." The authorities mistakenly believed this was a real manual for electronic warfare and computer intrusion. In March 1990, agents raided Steve Jackson Games’ offices, seizing computers, manuscripts, and even the original drafts of what would become the GURPS Cyberpunk book.

Warehouse 23: The official online store for Steve Jackson Games .

: A collection of three ready-to-run adventures designed for the setting. GURPS Ultra-Tech

4. The London Sourcebook (Included in the PDF)

Unlike the standalone GURPS Cyberpunk book, many modern PDF bundles include the London Sourcebook—a 32-page expansion that details a dystopian, flooded London. It is arguably better than the original US-based setting because it focuses on class warfare, smuggler dens, and the clash between MI5's digital division and anarchist hacker cells.