Piece counts range from 958 to 4,383 pieces. Both sets list a suggested age of 18 years and up.
They include removable elements to inspect interior details: a roof that can be removed to view interior columns and arches, and towers that can be lifted off to look inside.
Product listings highlight several developmental focuses, including sensory development, fine motor skills, gross motor skills, and creative thinking. These focuses are presented across the different sets.
Materials are listed as plastic, and the product details state: 'Battery: No Battery Used.'
The listings note access to the LEGO Builder app, which provides 3D instructions you can zoom and rotate, plus tools to track and save your progress.
