Teach your children about numbers from 1 - 20 and differentiating between colours on the puzzle. By shuffling the numbers and letting your child find the appropriate place its helps them coordinate and observe the forms.
This is a puzzle for different ages since after the forms they would learn the sequence of numbers and a later stage doing mathematics calculations which is an import phase of their life.
It also helps with the concentration and analytical thinking.
Appropriate to start as from 30 months.