Materials is an option in the Menu and it is what you use to build your prison.
There are multiple flooring and wall materials within the game and they are located within the Materials menu. This menu has the functionality to change flooring types, build or demolish walls and remove tunnels.
The materials in the game are as follows.
|Concrete Tiles||Concrete Floor||Wooden Floor||Ceramic Floor|
|Mosaic Floor||Metal Floor||Marble Tiles||White Tiles|
|Fancy Tiles||Concrete Wall||Brick Wall||Perimeter Wall|