A flat, single-level circular open ...

A flat, single-level circular open pavilion. All gameplay space stays on one flat ground floor, no islands, no elevation changes, no upper floor to walk on. Above the central area, add a single decorative open archway or canopy structure (not enclosed, no walls, open on all sides, purely architectural, nothing to walk on top of), supported by a few thin pillars around the edge. Use only one single block for the entire structure: quartz block. No other materials, no wood, no glass, no plants, no decorative variety — the whole structure, floor, pillars, and archway, must be made of quartz block only. Overall style: minimalist and geometric, clean lines, symmetrical, open with visible sky. Radius about 20 blocks for the ground area, arch/canopy centered above.