Tile bases and caps come in 1, 2, 3, 6 and other configurations. There are no clips, everything connects with a U-shaped edging, and snaps together like upside-down Legos. Base surfaces are female-sided; base and cap undersides are male-sided, like so:
Expansion sets so far: Graveyard, pine forest, overhead tree fort & wooden bridges, waterfalls (with hex stone pillars of varying height), lava, rock overhangs...
Base colors: Brown, grey, lava orange, white
Cap textures: grass, stone, cobblestone, cooled "holey" lava, sand, mud, water, wooden walkways (tree fort only?)...snow?
www.hygroundtiles.com