"Simple, great. I have only introduced the basic shapes (not yet the 3d).
My 3 year old loves it and is learning extra shape names (and recognizing letters) like Oval and Rectangle which we often don't speak about regularly.
My 18 month old can start to match the colors and shapes to each other, and the 3 year old is proud to help find the right ones sometimes.
Additional benefit. Sometimes my laminated-then-cut shapes peel in half due to lots of handling, which means my kids get a mini-repair project with glue to paste the halves back together..."
Shapes Activities Bundle, Printable Shape Game, Preschool Shapes, 3D shapes, Kid Classroom Poster, Homeschool Resource, Kinder Learning Game