5 years & up. Imagine, build, create! This Plus Plus 450 Piece Building Set is a new kind of construction toy that features one simple shape to unleash ideas of endless possibilities. The unique shape design allows kids to construct 2D or 3D and even curved structures. Bricks come in a mix of 6 different basic colors. Gain some inspiration with the full-color, fold-out Idea Guide booklet. Each set includes an Idea Guide booklet.