One of the three courses doesn't mean that your child doesn't need to play elementary or intermediate courses from the age of 6, but it needs to be based on your child's brain development level. Maybe your 3-4-year-old baby's brain is fully developed, so this baby may pass all the courses of Ubisoft thinking training machine. If the development is not good, the elementary course may be difficult for him.
After using the thinking training machine again, your baby can reach the intellectual development level of Montessori-educated babies of the same age, which is at least 40% higher than that of ordinary children.