🧮 24点24 Game
在线 24 点游戏：随机发 4 张牌（保证有解），用加减乘除把它们算成 24；点数字和运算符逐步合并，支持分数、撤销、看答案，统计连对次数。Play the 24 Game online: four random cards (always solvable) — combine them with +, −, ×, ÷ to make 24. Tap numbers and operators step by step with fractions, undo, show-answer and a streak counter.
先点一个数字，再点运算符，再点另一个数字，两张牌会合成一张结果牌；最后剩下一张 24 就成功。键盘：1–4 选牌，+-*/ 运算，U 撤销，N 下一题。Tap a number, an operator, then another number — the two merge into their result. Finish with a single 24. Keyboard: 1–4 pick cards, +-*/ operators, U undo, N next.
玩法说明与常见问题How to play & FAQ
「24点」怎么玩？How do I play 24 Game?
每题给出 4 个数（A=1，J=11，Q=12，K=13），每个数必须且只能用一次，用加、减、乘、除和任意顺序把它们算成 24。例如 3、3、8、8 可以算 8 ÷ (3 − 8 ÷ 3) = 24。Each round shows four numbers (A = 1, J = 11, Q = 12, K = 13). Use every number exactly once with +, −, × and ÷ in any order to make 24. For example 3, 3, 8, 8 gives 8 ÷ (3 − 8 ÷ 3) = 24.
每道题都有解吗？Is every hand solvable?
是的。发牌后程序会先用穷举求解器验证，只出有解的题；「看答案」会显示其中一种解法。Yes. Every hand is checked by an exhaustive solver before it is dealt; “Show answer” displays one solution.
可以用分数吗？Can I use fractions?
可以，中间结果按精确分数计算（例如 8/3），不会有小数误差。Yes — intermediate results are exact fractions (such as 8/3) with no rounding errors.
连对是怎么算的？How does the streak work?
自己算出 24 连对加 1；点「看答案」或跳过未解的题会清零。最高连对保存在浏览器本地。Solving a hand yourself adds 1; showing the answer or skipping an unsolved hand resets it. Your best streak is saved locally.
「24点」免费吗？需要下载吗？Is 24 Game 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.