When these were opened by my son on Christmas morning, I was very dubious about the box and the shape of the pieces. However, several hours later, fingers sore from frantic clicking, I realised that this was a toy my children would use and use.
Since then, we've had all sorts of creations from crowns to Tyrannosaurus Rex to swords.....
The instruction booklets that come with the box give you a list of all the different joints, both static and moving, that can be made together with picture guides to make increasingly complex creations.
This is a versatile and compulsive toy. A big hit with my two boys!