Building blocks like the GUIDECRAFT IO Blocks® - 500 Piece Education Set will give your child hours of enjoyment while enhancing his or her STEM skills at the same time. Aside from this, these building blocks will also help improve your child's ability to solve problems. They come in 12 different shapes that fit together snugly to help your child build whatever he or she wants to create. These plastic building blocks come in 6 colors. They are available in sets that include a travel case that locks and holds 59 pieces and a 1,000 piece set made for large groups of children. The largest block pieces are 1.5 inches wide, 1.5 inches long, and .5 inches deep. You can purchase these IO Blocks from Google Play. At the Apple App Store, you'll find an app for smartphones and tablets.