Human methods of regulating the system state in operation is analyzed with the aid of a simple computer game. The computer game employed is a two-dimensional simulator of system regulation procedures where a nonlinear relationship between the state and the corresponding operating condition. The game was played by human players (beginners and good players who know its mechanism) and a computer program. Comparing their results, some features of human players are discussed in order to utilize the results in constructing supervisory systems for systems in operation.