Great game for a 4 year old
the free version made me quickly decide that buying the full version was going to keep my 4 year old daughter busy when we are in boring situations (i.e. grocery shopping or at the airport).
she quickly picked up how to play and loves the different puzzles.
the one thing i would suggest would be adding more puzzles - and working on having the puzzles come up more randomly as it appears that they are in the same order whenever you need to restart, it seems like your doing the same ones over and over.
Ron_robichaud about
ShapeBuilder Preschool Puzzles