Objective. To assess the effectiveness of intervention with the Nintendo ® Wii (NW) as a complementary therapy for rehabilitation of gross motor function and balance in patients with cerebral palsy (CP). Method. Case study with 2 patients with clinical diagnosis of spastic diparetic CP, classified by the Gross Motor Function Classification System (GMFCS) and evaluated through the scales Pediatric Balance Scale (PBS) and Gross Motor Function Measure (GMFM-88). They undergone into a standardized intervention with NW twice a week for 20 sessions, after physical therapy. Results. Both the subjects 1 and 2 showed an increase in the score of the scales PBS and GMFM-88. Conclusions. 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