Software on a server transmits a copy of a string of text data containing game state parameters to a client device executing an instance of a computer-implemented game. The string is serialized and unstructured. The instance modifies the game state parameters according to game logic and events generated by a user as the user plays the game. The software on the server then receives a batch file transmitted after a threshold period of time by the instance. The batch file includes a plurality of events. The software processes the plurality of events in the batch file against game logic to update one or more of game state parameters in the string and stores the text data in the updated string in a persistent database.