Experience a perfect, continuous grid through the entire play space with our patented, modular, ultra-slim interior walls. Additionally, all tiles are reversible with wood design on one side and stone on the other for double the functionality! WarLock Tiles: Expansion Box I adds more of the essentials to build out your gameplay environment. More walls, clips, doors, and pillars to build more complex dungeons and scenarios. Fully compatible with all other WarLock Tile products.