The use of technology in children s neuropsychological assessment offers a series of facilities such as: time optimization, cost reduction and better refinement of cognition through reaction time. In Brazil, this type of evaluation is scarce, especially for executive measures in childhood. In order to suppress this demand, we investigated the evidence of validity of the computerized executive tool Game of Magical Letters (JCM), composed of three phases: classification by color (12 items), by form (12 items) and by color and form items) in 113 children aged six to nine years old (M equals 7.58) and (SD equals 1.07) without atypical development, enrolled in private schools and social institutions in the northern part of the city of Rio de Janeiro. In addition to the JCM instrument, others were applied: WASI, Stroop, Scale Digits (WISC-IV), Tracks A B, Verbal Fluency and Inventory (SSRS) for children, parents and teachers in three 30-minute alternating-day meetings. Mixed ANOVA was performed to verify age and sex effects on the gross scores of JCM. Then, Factorial Analysis with extraction method the Principal Components and varimax rotation with Kaiser criterion. The data revealed that there was no interaction between the variables, but the factorial analysis resulted in four components named respectively: executive aspects, regulatory aspects, attentional and fluid aspects. We suggest new researches with the JCM expanding the sample with later age and new protocols of executive instruments, including computerized ones already validated in the Brazilian context for eventual convergent validities and criteria to be investigated.