“PlayStation Underground Jampack” discs for the Sony PlayStation were compilation discs that provided players with playable demos, trailers, and other content related to upcoming or recently released PlayStation games. These discs were often included with subscriptions to the PlayStation Underground magazine or sold separately.

The core function of “PlayStation Underground Jampack” discs was to:

• Provide Game Demos: They offered playable samples of various PlayStation games.
• Showcase Trailers: They included trailers for upcoming releases.
• Offer Exclusive Content: Sometimes included behind-the-scenes footage, interviews, or other bonus material.

These Jampack discs were a way for PlayStation to promote its games and give players a taste of what was to come.