⬛ 数字涂黑Number Blackout
在线数字涂黑逻辑谜题：在数字方格里涂黑一些格子，使每行每列剩下的白格数字都不重复；涂黑的格子不能左右或上下相邻；所有白格必须连成一片。点一下涂黑，再点一下画圈标记“确定保留”，第三下清除。5×5 到 8×8 无限随机生成，带错误提示、撤销和提示功能。Number Blackout online: shade some cells of a number grid so that no number repeats in any row or column among the white cells, shaded cells never touch side by side, and all white cells stay connected in one area. Tap once to shade, again to circle a cell you are sure stays white, and a third time to clear. Endless random 5×5 to 8×8 puzzles with error highlighting, undo and hints.
点击：涂黑 → 画圈 → 清空。电脑上右键直接画圈。Tap cycles: shade → circle → clear. On a computer, right-click circles directly.
玩法说明与常见问题How to play & FAQ
「数字涂黑」怎么玩？How do I play Number Blackout?
三条规则：① 同一行、同一列里没被涂黑的数字不能重复；② 两个涂黑的格子不能共用一条边；③ 所有白格要能上下左右连通。常用技巧：夹在两个相同数字中间的格子一定是白格；一个格子被涂黑后，它上下左右四格都一定是白格，可以画圈标记。Three rules: (1) no number may repeat among the unshaded cells of a row or column; (2) two shaded cells may not share an edge; (3) all white cells must connect up, down, left and right. Useful tricks: a cell sandwiched between two identical numbers must stay white, and once a cell is shaded its four neighbours must all be white — circle them.
题目有唯一解吗？Does each puzzle have a unique solution?
题目是随机生成的，保证至少有一种解法；如果你找到另一种同样满足三条规则的涂法，也同样算过关。Puzzles are generated at random and always have at least one solution; any shading that satisfies all three rules counts as solved.
提示会直接告诉答案吗？Does the hint just give the answer?
提示每次只纠正一个格子：该涂黑的帮你涂黑，不该涂黑的帮你画圈。Each hint fixes a single cell — shading one that should be shaded, or circling one that should stay white.
「数字涂黑」免费吗？需要下载吗？Is Number Blackout 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.