Try these cardboard blocks and here’s why:
They can stack them high or wide
They can integrate them into play with other toys
They can design structures
They can build forts with them
They can start to play with them as young as 6 months (with supervision) till they’re in elementary school
They can count or compare them
They can build patterns or symmetrical designs with them
They can measure them (or other things)
They can learn science with them (weight, physics, etc.)
They can play with them by themselves
They can share and work on a project with someone else
And many more ways!
If you’re not sure about buying them, try renting them first from https://www.kidsmoveandlearn.com/rentalitems
If you already have some please share how your child used them. Post a picture below!