➰ 数回Loop Puzzle
在线数回（画回路）逻辑谜题：沿着点阵之间的虚线画线，连成一个不交叉、不分叉的闭合回路，每个数字表示它四周有几条边是回路的一部分；5×5、7×7、10×10 三种尺寸和三档难度，每题唯一解，可拖动连线、打叉标记、撤销、提示和检查。Play the loop puzzle online: draw lines between the dots to form one closed loop that never crosses or branches, where each number tells how many of its four sides belong to the loop. Three sizes (5×5, 7×7, 10×10) and three levels, a unique solution every time; drag to draw, mark crosses, undo, get hints and check your work.
点两个点之间的空隙：第一次画线，第二次打 ✕（确定不是回路），第三次清除；也可以按住从一个点拖到相邻的点连续画线。右键直接打 ✕。U 撤销。数字变灰表示四周的线数刚好；红色表示线太多，红点表示那里分叉了。Tap the gap between two dots: once draws a line, twice marks a ✕ (definitely not part of the loop), three times clears it. You can also drag from dot to neighbouring dot to draw several lines. Right-click marks a ✕ directly; U undoes. A number turns grey when it has exactly enough lines, red when it has too many; a red dot marks a branch.
玩法说明与常见问题How to play & FAQ
「数回」怎么玩？How do I play Loop Puzzle?
目标是画出唯一一个闭合回路：回路沿着格子的边走，每个点要么不经过，要么正好进出各一次（不能分叉，也不能交叉），整张图里只能有一个回路。格子里的数字（0–3）表示这一格的四条边里有几条属于回路，没有数字的格子不限。先从 0 周围全部打叉、角上的 3 等确定的地方入手，再顺着已经画出的线延伸。The goal is a single closed loop that runs along the edges of the cells. Every dot is either unused or visited exactly once (no branches, no crossings), and there may be only one loop on the board. A number from 0 to 3 says how many of that cell's four sides are part of the loop; blank cells can have any number. Start with certainties — cross out everything around a 0, look at 3s in corners — then extend the lines you already have.
有哪些入门技巧？What are some starter techniques?
0 四周的四条边一定都不是回路；角落里的 3 必定占用靠角的两条边；相邻的两个 3 之间那条边以及它们外侧的两条平行边一定在回路上；回路不能在某个点“断头”，所以只有一条线进来的点必须再出去一条。All four sides of a 0 are never part of the loop; a 3 in a corner always uses the two corner edges; two adjacent 3s always share the edge between them plus the two parallel outer edges; and the loop can't dead-end, so a dot with one line coming in must have exactly one going out.
为什么要打叉？Why mark crosses?
打 ✕ 表示你已经确定这条边不在回路上，它不会影响答案判断，但能让你看清剩下的可能路线，是解大题时最有用的记号。A ✕ records that you are sure an edge is not part of the loop. It doesn't affect the result, but it makes the remaining possibilities much easier to see — essential on larger puzzles.
「数回」免费吗？需要下载吗？Is Loop Puzzle free? Do I need to download anything?
完全免费，无需注册、下载或安装，打开网页就能玩，手机、平板和电脑都支持；游戏完全在你的浏览器本地运行，不会上传任何数据。It is completely free with no sign-up, download or install — just open the page on a phone, tablet or computer. The game runs entirely in your browser and nothing is uploaded.