UV666Zenith is a portrait layered screw puzzle app that combines observation, memory, and sequential operation. Players must remove the topmost colored hexagonal screws from stacked wooden boards in the marked order. Each successful removal earns points. Tapping the wrong screw immediately ends the round, with a red flash and vibration alert. As levels advance, the grid grows larger, layers increase, and screw colors become more similar, steadily raising the difficulty. After fully clearing one layer, the next layer automatically appears; clearing all layers advances to a new level. If a key screw is blocked and cannot be removed, the round also ends. The app supports pause, restart, and high-score recording. The rules are simple and the pace tight, testing both observation and strategic planning, perfect for quick challenges during short breaks.