Abstract: A run-time environment for use with multiple multi-player, networked games and simulations includes a game model which defines the specifics of a game and a game engine which runs the game defined in the game model. The game model includes a database which stores the objects and their properties (properties include communicable properties) as well as the rules of the specific game which are to be executed on the objects and their properties. The game engine includes a rule evaluator, a database engine, a triggering mechanism and a communication unit. The rule evaluator evaluates the rules thereby changing the properties. The database engine updates the database whenever a property is changed. The triggering mechanism activates the rule evaluator whenever database engine changes a property. The communication unit is activated by the triggering mechanism whenever a communicable property changes and transmits the changed communicable property to another simulation unit.