Introduction. Increased attention to the psychological well-being of younger schoolchildren and the development of 21st century skills requires the integration of playful, experimental and non-standard forms of learning. The purpose of the study is to substantiate the psychological potential of the "naughty" construction technique and to determine its effectiveness in a modern educational environment. Materials and methods. The research included a theoretical analysis of psychological and pedagogical literature, a review of foreign models of creative education (Reggio Emilia, Cardboard Play City, STEAM labs), as well as the design and implementation of tasks in a "naughty" format within the framework of the program "ENGINERiYA: travel from the future to the past with your favorite designer." The empirical part was based on the observation of primary school students (n = 86) using a diagnostic checklist, which made it possible to track changes in the emotional and behavioral state of children. Statistical processing included a qualitative analysis – the collection of expert opinions from teachers, as well as a comparative analysis of the results of psychological state indicators before and after classes using the Fisher angular transformation (φ* criterion). The results of the study. The data obtained showed that participation in classes on "naughty" construction has a significant impact on the psychological state of younger schoolchildren. According to the results of the comparative analysis, significant positive changes were recorded in all key indicators: the level of emotional state increased from 2.10 to 2.56 (φ* = 6.149), behavioral reactions – from 2.05 to 2.58 (φ* = 6.586), speech activity – from 2.00 to 2.51 (φ* = 6.457), and self-esteem – from 0.67 to 0.84 (φ* = 5.767). These results confirm that classes help reduce learning anxiety and fear of error, enhance emotional engagement, initiate an increase in speech and communication activity, and develop meta-subject skills. The technique stimulates creative and divergent thinking, strengthens trust in one's own imagination and promotes the formation of a positive attitude towards the learning process. Conclusion. The method of "naughty" construction is an innovative pedagogical technology that provides a psychologically safe educational environment due to freedom of imagination, error tolerance and elements of game uncertainty. The study confirms its effectiveness in the development of universal learning activities, the formation of emotional comfort and the subjective position of a primary school student. The results obtained confirm the expediency of further large-scale testing and integration of the approach into primary education programs.