🧠 数字记忆挑战Number Memory Test
在线数字记忆测试：屏幕先显示一串数字，几秒后消失，你要把它准确输入出来；每答对一次数字就多一位，看看你能记住几位。可选从 3 位或 5 位开始，也可以开启 3 次机会模式，自动记录最高位数，锻炼短时记忆和专注力。Number memory test online: a number appears for a few seconds, then disappears and you type it back. Each correct answer adds one more digit — how many can you hold? Start from 3 or 5 digits, optionally with three lives, and your best length is saved. A quick short-term memory and focus workout.
数字消失后用键盘或下方数字键输入，按回车或 ✓ 提交。显示时间会随位数变长（每位约 0.6 秒）。Once the number disappears, type it with the keyboard or the keypad and press Enter or ✓. Display time grows with length (about 0.6 s per digit).
玩法说明与常见问题How to play & FAQ
「数字记忆挑战」怎么玩？How do I play Number Memory Test?
普通人的短时记忆大约能记住 7 位左右的数字。想记得更多，可以把数字分组，比如把 58203917 记成 582-039-17，或者给几位数字编一个小故事。每次答对都会增加一位，答错就结束（开启 3 次机会时可以错 3 次）。Most people can hold about seven digits in short-term memory. To go further, chunk the number — remember 58203917 as 582-039-17 — or make up a little story for groups of digits. Each correct answer adds a digit; one mistake ends the run, or three with lives turned on.
数字是随机的吗？Are the numbers random?
是的，每一位都是随机生成的，首位不会是 0。Yes, every digit is random and the first digit is never 0.
分组显示会不会太简单？Doesn't the grouping make it easier?
显示时每三位加一个空格只是为了好读，输入时不需要空格，你也可以按自己的方式分组记忆。The spaces every three digits are only for readability; you don't type them, and you're free to chunk the number your own way.
「数字记忆挑战」免费吗？需要下载吗？Is Number Memory Test 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.