Like its real world counterpart, walls are obstacles that prevent movement. However, armed characters can swing their weapons through walls. There also exist hard walls, which are functionally identical to normal walls but do not feature a mosaic pattern away from the wall's edges.
They may come in all colors and shapes, but walls will inevitably block the movement of any creature that tries to walk through them. The only exception is the seep, whose sole domain are walls and doors.
- Walls block the movement of any creature that tries to walk through them, except for seep.
- Walls are considered obstacles by brains, except when generating seep pathmaps.
- Walls block briar, tarstuff, aumtlich beams, evil eye sights, and explosions.