Answer: Pucca bricks
Notes: The Indus Valley Civilization, marked by its remarkable level of urbanization despite being a Bronze Age culture, is noted for its cities built of brick, roadside drainage system, and multistoried houses. Houses were one or two stories high, made of baked brick, with flat roofs, and were just about identical. Each was built around a courtyard, with windows overlooking the courtyard. The outside walls had no windows. Each home had its own private drinking well and its own private bathroom.
