Post Master is a simulation game where players take control of a mail distribution company in a growing city. Starting with a single post office, users must manage various aspects of the business including hiring workers for sorting mail, contracting security to protect assets, and acquiring vehicles for efficient delivery. As the city expands, players will face the challenge of maintaining excellent service while competing against rival delivery businesses.

Strategic planning is crucial as players decide whether to focus on providing exceptional service within a limited area or to expand their operations across the city. The game allows for customization of delivery routes and pricing strategies, enabling users to keep their operations competitive. With the right decisions, players can build a vast postal empire while navigating the challenges of city growth and competition.