Review on PicassoTiles Magnetic Expansion Set: Enhancing Construction and Education by Bruce Marable

Unfortunately they are so hard that they don't work. After we pulled them out of the template they were in, most of the parts came loose before we could use them. Then, in order for them to stick to the tile, they have to lie perfectly flat on the tile, which they aren't; They all tend to be slightly concave which makes them hardly sticky and the magnets aren't strong enough to hold them well. This is way too complicated and difficult to use for my 3 year old twins and my 5 year old son. A simple swipe of your finger makes the lids fall off. I liked the idea, but the beauty of magnetic tiles is that they are easy to use (especially for toddlers who work hard and are sensitive to building difficulties) and that unfortunately kills them.