It has been discovered about a decade ago that autistic people cannot properly understand and reproduce mental states and emotions. In this study we suggest a particular emotion rehabilitation strategy, based on playing with mental simulator that is capable of modeling the mental and emotional states. We present the model of mental world, approach the formalization of emotions, describe interface and reasoning mechanism of the multiagent mental simulator NL_MAMS. Also, we discuss the case studies of substantial improvement of emotional and mental reasoning skills of two patients.