🧮 杀手数独Killer Sudoku
在线杀手数独（笼子数独）：在 9×9 盘面填 1–9，每行、每列、每个 3×3 宫数字不重复，同时虚线围起的每个“笼子”里的数字之和要等于左上角的提示，且笼内数字不重复；三档难度，每题唯一解，支持铅笔标记、撤销、提示、冲突检查，并列出当前笼子可能的数字组合。Play killer sudoku online: fill the 9×9 grid with 1–9 so no digit repeats in any row, column or 3×3 box — and the digits inside every dashed cage add up to its small clue without repeating. Three difficulty levels, a unique solution every time, pencil notes, undo, hints, conflict checking and a list of the possible digit combinations for the selected cage.
点格子选中，再点数字或按键盘 1–9 填入，Backspace 擦除，方向键移动。打开「笔记」（或按 N）后填的是小号候选数字。U 撤销。虚线框是笼子，左上角小数字是笼内数字之和；红色表示数字重复或笼子的和不对。Click a cell, then tap a digit or press 1–9; Backspace erases and the arrow keys move. Turn on “Notes” (or press N) to pencil in small candidates; U undoes. Dashed outlines are cages and the small number is the sum of the cage; red marks repeated digits or a cage that doesn't add up.
玩法说明与常见问题How to play & FAQ
「杀手数独」怎么玩？How do I play Killer Sudoku?
杀手数独保留普通数独的全部规则：每行、每列、每个粗线 3×3 宫都要恰好包含 1–9。不同的是盘面上一开始几乎没有数字，而是用虚线把格子分成一个个“笼子”，每个笼子左上角写着笼内数字之和，同一个笼子里的数字也不能重复。解题时先找只有一种组合的笼子（例如 2 格和为 3 只能是 1+2，2 格和为 17 只能是 8+9），再利用“每一行、列、宫之和都是 45”的规律推出剩下的数字。Killer sudoku keeps every normal sudoku rule: each row, column and bold 3×3 box contains 1–9 exactly once. The difference is that the grid starts almost empty; instead it is divided by dashed lines into cages, each with the sum of its digits in the corner, and digits cannot repeat within a cage. Start with cages that have only one combination (two cells summing to 3 must be 1+2, two cells summing to 17 must be 8+9), then use the fact that every row, column and box adds up to 45 to deduce the rest.
“45 法则”是什么？What is the “rule of 45”?
任意一行、一列或一个宫里 1–9 的和都是 45。如果几个笼子几乎正好覆盖某个宫，只多出或少了一两格，用 45 减去（或加上）这些笼子的和，就能直接算出多出来那几格的和，这是杀手数独最常用的技巧。Any row, column or box adds up to 45. When a few cages almost exactly cover a box with one or two cells sticking out (or missing), subtracting their sums from 45 gives the total of those odd cells directly — the single most useful killer sudoku technique.
三档难度有什么区别？How do the levels differ?
简单题的笼子较小，组合少，容易起步；困难题的笼子更大，需要多用 45 法则和组合排除。所有题目都由程序生成并验证只有唯一解，必要时会给出一两个数字。Easy puzzles use small cages with few combinations so they are quick to start; hard puzzles use bigger cages that call for more rule-of-45 and combination logic. Every puzzle is generated and verified to have exactly one solution, adding a given digit or two when needed.
「杀手数独」免费吗？需要下载吗？Is Killer Sudoku 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.