
Memory Chess: Free Chess Memory and Visualization Game
Memorize a chess position, rebuild it from memory, and get an instant score. Play free to train board vision, visualization, and spatial memory.
@Bing_Builds · X
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Memorize a chess position, rebuild it from memory, and get an instant score. Play free to train board vision, visualization, and spatial memory.
@Bing_Builds · X

Play classic online games like Minesweeper, Sudoku, Tic Tac Toe, and Solitaire.
@iamdeepak89 · X

Practice algorithms and coding skills through interactive challenges where AI agents build and test your code.
u/Death12th · Reddit
Free consumer product, seat-based education product, enterprise assessment product. Same codebase. Is this survivable? Three motions off one core. Students practice free and generate cost, not revenue. Educators pay per seat. Hiring teams are the expensive product and the reason any of it matters. The free tier feeds both paid ones and that's the only thing justifying it. Education is slow, cheap, sticky. Hiring is faster, pricier, and churns the second the role gets filled. Billing got

A daily puzzle game where you spot AI-generated errors to sharpen critical thinking.
u/CogniKing · Reddit
Play Parry — a 2-minute daily puzzle about catching AI's mistakes: spot the planted flaw, catch the answer that's lying to you I have been recently fascinated with puzzles as a way to help improve my BS-radar when using AI. I designed Parry to help with this - One puzzle a day - find the one flaw hidden in a confident paragraph, pick which of two AI answers actually helps you (one is subtly useless), call a claim true/false. Free, no account, nothing you input leaves your devi

Take quick online tests and get instant results to track your progress.
Nalife520 · V2EX
做了一个在线反应、记忆与专注力测试网站 最近做了一个叫 [PickTests]( https://picktests.com/) 的在线测试站。 反应时间、序列记忆、瞄准训练这些东西,网上其实已经有很多了。真正让我想重新做一遍的,是不少页面要么堆了很多不必要的内容,要么广告和装饰比测试本身更抢注意力,到了手机上也不一定顺手。 所以我给这个项目定了一个比较克制的方向: 不急着增加更多测试,先把每一个已有的测试认真做好。 目前上线了 6 个测试: - 反应时间 - 瞄准训练 - 序列记忆 - 数字记忆 - 多目标追踪 - 斯特鲁普测试 首页:[反应测试]( https://picktests.com/zh/) 网站使用纯 HTML 、CSS 和 JavaScript ,没有账号系统。成绩保存在当前浏览器,打开页面就可以开始。 我现在主要在调整这些细节: - 操作是不是足够顺手 - 测试节奏会不会太快或太慢 - 结果能不能一眼看懂 - 动效和反馈会不会太多 - 手机、平板和电脑上的体验是否一致 目前最想先做好的页面

Learn Japanese with AI tutor feedback and spaced repetition exercises.
u/Blazikenfire · Reddit
I built Language Learning website with hint of AI grading A few years back, I enrolled in a Japanese language course at Mumbai University. It was a pretty rough experience. The teacher was incredibly loud as in literally shouting at people's every mistake, and the pace was unforgiving. If you missed just one or two lectures, suddenly everything looked like alien text and you were completely left behind. The environment was so tense that asking a simple doubt made you regret ever joining the

Improve your reasoning by solving adaptive AI-generated puzzles that learn from your mistakes.
u/connerpro · Reddit
IntelligenceMax - Adaptive reasoning practice with live AI questions (claim-safe near vs far) submitted by /u/connerpro to r/SideProject [link] [comments]

Generate randomized math formula problems to practice.
@7spiritz · X
Check out what I just built with Lovable!

Turn school topics and confusing text into interactive stories and infographics.
@hazemnassr · X

Learn to code and build projects through interactive games and challenges designed for the LLM era
@RahimNathwani · X
Not a direct answer but the guys at Exercism (non-profit that publishes really good and free programming language self-study courses) recently launched a separate site to teach junior programmers both vibe coding and software engineering fundamentals.

Learn math, science, finance through 450+ interactive mini-games and lessons.
@PAIMultiverse · X

Quiz platform for kids (Grades 1-10) to practice and learn through interactive quizzes.
@lodha13 · X
Checkout below apps Hisabarabar (Play Store)