Learning Resources STEM Explorers Brainometry. Solve brain teasing Mental Blox puzzle challenges that encourage shape recognition, spatial reasoning, critical thinking, and fine motor skills. The 4 different colours and patterns boost recognition skills. This fun set includes 24 shapes and 10 challenge cards. Includes multilingual packaging and Activity Guide. Largest piece measures 2.5cm H x 3.5cm W. 34 Piece Set.