- Security mechanisms may require users to deal with the tradeoff between risky and efficient or safer yet less efficient use of a production system. We present an experimental sys-tem (microworld), based on the Tetris game, that can serve as a research tool for studying behavior regarding the usabil-ity and security tradeoff. This paper describes the system's main components and the variables the experimenter can manipulate. Also detailed here are the data collection pro-cess and the analysis methods. The collected data from the microworld allow researchers to explore and model usability and security tradeoffs in the context of user interaction with security systems and psychological acceptability.