➕ 数和游戏Cross Sums
在线数和游戏（交叉和数字谜题）：在白格里填 1–9，让每一段横向和纵向连续白格的数字之和等于黑格上的提示，同一段里数字不能重复；三种尺寸，每题唯一解，自动标出冲突，还会列出当前格可能的数字组合，带提示和计时。Play cross sums online: fill the white cells with digits 1–9 so every horizontal and vertical run adds up to the clue in the black cell next to it, with no digit repeated within a run. Three sizes, every puzzle has a unique solution, conflicts are flagged automatically and the possible digit combinations for the selected cell are listed, with hints and a timer.
点一个白格选中它，再点下方数字或直接按键盘 1–9 填入，Backspace 擦除，方向键移动。黑格斜线右上角的数字是右边那一段横向白格之和，左下角的数字是下面那一段纵向白格之和。加粗的数字是题目给定的。选中格子后，下方会列出这一格所在两段可能的数字组合。Tap a white cell to select it, then tap a digit below or press 1–9; Backspace erases and the arrows move. In a black clue cell, the number at the top right is the sum of the white run to its right, and the number at the bottom left is the sum of the run below it. Bold digits are given. When a cell is selected, the possible digit combinations for its two runs are listed below.
玩法说明与常见问题How to play & FAQ
「数和游戏」怎么玩？How do I play Cross Sums?
数和游戏有点像数字版的填字游戏。每一段连续的白格（横向或纵向）都有一个提示数字，写在它左边或上边的黑格里。你要在每个白格填 1 到 9 中的一个数字，使每一段的数字加起来等于提示，并且同一段里不能出现重复数字。比如 2 格之和为 3 只能是 1 和 2，3 格之和为 24 只能是 7、8、9——从这些“唯一组合”入手最容易。Cross sums are like a crossword with numbers. Every run of consecutive white cells, across or down, has a clue written in the black cell to its left or above it. Put a digit from 1 to 9 in each white cell so each run adds up to its clue, without repeating a digit inside a run. For example, two cells summing to 3 must be 1 and 2, and three cells summing to 24 must be 7, 8 and 9 — start from such unique combinations.
为什么有些格子一开始就有数字？Why do some cells start with digits?
为了保证每道题都只有唯一答案，生成器会在必要的位置给出少量粗体数字作为起点。粗体数字不能修改。To guarantee every puzzle has exactly one answer, the generator gives a few bold starting digits where they are needed. Bold digits cannot be changed.
组合提示怎么用？How do I use the combination list?
选中一个白格后，下方会列出它所在的横向段和纵向段所有可能的数字组合（已经填入的数字会被考虑进去）。两段组合里都出现的数字才可能填在这一格，这就是解题的关键交叉推理。With a white cell selected, the list shows every digit combination that can still fill its across run and its down run, taking digits already entered into account. Only a digit that appears in both lists can go in that cell — that crossing logic is the heart of the puzzle.
「数和游戏」免费吗？需要下载吗？Is Cross Sums 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.