Click cells to set the current lights, then get the fewest clicks that turn every light on. Pressing a light flips it and its up/down/left/right neighbours.
Yellow = on, dark = off. Red rings mark the cells to press.
One row per line, as many rows as columns. On: 1 # X * ●, off: 0 . - ○. Size is detected automatically.
Set up the board, then press “Solve puzzle”.
点击格子设置当前灯的状态，求出把所有灯点亮的最少点击解法。点一个灯会翻转它自己和上下左右相邻的灯。
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。
Click cells to set the current lights, then get the fewest clicks that turn every light on. Pressing a light flips it and its up/down/left/right neighbours.
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.