This double Gold award winning Junior set is safe in play areas also used by children under three years. The side joining Squares and Triangles allow hundreds of models and shapes. A large range of instructions at up to six levels of difficulty can be provided, from easy to follow full size models to place the bricks on, to more difficult 3d shapes that they will soon want to build. The Squares fit to most other traditional brands with studs. It is recommended for ages 3-6.