🏝️ 数岛Island Puzzle
在线数岛谜题：在格子里涂出连成一片的“海”，让每个数字所在的“岛”正好有这么多格。岛与岛之间不能上下左右相邻，每个岛只含一个数字，海必须全部连通，而且不能出现 2×2 的整块海。随机生成 5×5、7×7、9×9 三种大小，可标记小岛、撤销、记录最快用时，任何符合规则的涂法都算过关。Island Puzzle online: shade the “sea” so that every number sits on an “island” of exactly that many cells. Islands may not touch side by side, each island holds exactly one number, all sea must be connected, and no 2×2 block may be entirely sea. Random 5×5, 7×7 and 9×9 puzzles with dot marking, undo and best times — any shading that follows the rules counts as solved.
点击格子：空白 → 涂成海（深蓝）→ 标为岛（圆点）→ 空白。电脑上右键直接标点；也可以用“点击”按钮固定一种标记方式。Tap a cell: blank → sea (dark blue) → island dot → blank. On a computer right-click places a dot; the “Tap” button can lock one marking mode.
玩法说明与常见问题How to play & FAQ
「数岛」怎么玩？How do I play Island Puzzle?
每个数字表示它所在的岛一共有几格（包括数字本身）。没有涂成海的格子都算陆地，相邻的陆地连成一个岛。要求：①每个岛恰好一个数字且格数相符；②所有海格上下左右连成一整片；③任何 2×2 的方块里不能全是海。技巧：两个数字之间只隔一格时，这一格一定是海；数字 1 四周全是海。Each number tells how many cells its island has, including the number itself. Every unshaded cell is land, and touching land cells form one island. Rules: ① each island has exactly one number and that many cells; ② all sea cells connect side by side into one area; ③ no 2×2 square may be all sea. Tips: a single cell between two numbers must be sea, and a 1 is surrounded by sea.
答案唯一吗？Is there a single answer?
题目由程序随机生成，可能有不止一种解法；只要你的涂法满足全部规则，就会判定完成。Puzzles are generated at random and may have more than one solution; any shading that meets all the rules is accepted.
红框是什么意思？What does a red frame mean?
红框标出了 2×2 全是海的区域，这是不允许的；红底的岛表示格数或数字个数不对。A red frame marks a 2×2 block of sea, which is not allowed; a red-tinted island has the wrong size or number count.
「数岛」免费吗？需要下载吗？Is Island 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.