Bounded first-person voxel construction with swept collision, supported target previews, safe held edits, optional edge-guard walking, reclaimable crafting, authored worlds and portable per-example saves. Introduction leads to a turning crossing requiring constructed access and a high span with distinct work areas and temporary footing. Data seams for skin, supply, recipe and geometry. WebGPU; keyboard/mouse, landscape multitouch and standard Gamepad API. Solo full cubes; no infinite terrain, survival or physical-device certification.