We are working on educational and programmable blocks for building activities and automatic spatial skills assessment of kindergarten children. Our tool will allow to assess these skills at a very early stage of child development, with no need for qualified teacher to be present during the test. The software evaluates complexity of the structure built by the child and gives straightforward score. We want to support pedagogical diagnosis by providing unbiased measure for kindergarten teachers and parents. Spatial skills are proved to be not just essential to developing child’s mathematical understanding but also strong predictors of future achievements in STEM disciplines.