Split the board into regions. Each region holds exactly one dot and looks the same after a 180° turn around it. Place the dots like the puzzle, then solve.
Click a cell centre, the middle of an edge or a grid corner to place a dot; click again to remove it.
把棋盘分成若干区域：每个区域有且仅有一个圆点，并且绕圆点旋转 180° 后与自身重合。照着题目放好圆点，再求解。
求解器免费使用，无需注册。谜题计算在浏览器中完成，录入的题目保存在当前浏览器；清除网站数据会删除这些记录。
先对照原题检查提示、尺寸和区域。显示“无解”表示录入的约束无法同时满足；取消或超时并不代表题目无解。可以先加载示例，确认录入与求解流程。
Split the board into regions. Each region holds exactly one dot and looks the same after a 180° turn around it. Place the dots like the puzzle, then solve.
This solver is free and requires no account. Puzzle calculations run in your browser. Saved clues remain in this browser; clearing site data removes them.
Check the clues and board size against the original puzzle. No solution means the entered constraints cannot all be satisfied. A cancelled or timed-out search does not prove that the puzzle has no solution. Use a built-in example to check the input workflow.