An internet gaming system includes a core platform, and a vertical extension functionality configured with the core platform and having a first application programming interface. A plurality of game specific modules are provided with a hardware and software configuration to conduct different respective Internet-based games with players via an Internet lottery site, with each game specific module including a dedicated second application programming interface. Input/output data between the core platform and the game specific modules occurs only through the first and second application programming interfaces. A secure game outcome generator has a hardware and software configuration to determine a game outcome for each game played via the system and is linked to the core platform via a secure interface with the vertical extension.