Postal: Special Delivery is an action-packed expansion for Mac that enhances the original gameplay experience. This full version introduces four new levels to the single-player campaign, featuring a variety of new non-player characters (NPCs) that enrich the game's narrative and interactions. The expansion also includes improvements in net code, ensuring smoother online gameplay, which is crucial for multiplayer sessions.

Additionally, players can now enjoy a cooperative mode for the single-player campaign, allowing friends to team up and tackle challenges together. These features not only add depth to the gameplay but also enhance the overall enjoyment of Postal: Special Delivery, making it a noteworthy addition for fans of the series.