
Playground — Fabraix
Test your prompt injection skills against AI agents in an interactive competitive challenge.
ibrahim_abdu777 · HN
We are giving away $100K > over the next 12 months to hack AI agents
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Test your prompt injection skills against AI agents in an interactive competitive challenge.
ibrahim_abdu777 · HN
We are giving away $100K > over the next 12 months to hack AI agents

Participate in community predictions; let time verify your guesses and track your rank.
geniushui · V2EX
我的第 4 个 Vibe coding 项目——猜一猜 网址: https://cai1cai.com/ 猜一猜,让时间验证你的判断 花了 2 天时间整出来的,请各位大佬给点建议!

Block distracting websites by solving math or coding puzzles.
hackitup7 · HN
TLDR built a Chrome site blocker that lets you into distracting sites only after you do some math or simple coding (JS only right now). Direct link to extension (the site just gives you more context): https://chromewebstore.google.com/detail/sphinx-earn-your-di... Philosophically it's a speed bump rather than a hard gate, because you'll eventually tear a gate down but you'll leave a speed bump. I've always eventually removed site blockers, or just had them become a nuisance that I reflexively dismiss before getting to distracting sites. Site blockers don't really reduce the "start navigating to a distracting site" muscle memory, and they eventually just become annoying. Dopamine is a hell of a drug. At the same time, I've been getting frustrated that my intermediate/advanced math skills have atrophied, and becoming more senior in my career (plus AI...) has caused my coding skills to atrophy even further. Realistically I'm not going to force myself to do math or coding exercises aft

Create predictions on any topic, trade with friends, and earn coins.
@FirasAtoui1 · X
Prediction Market on iMessage

Command an AI agent to fight battles in a multiplayer wuxia game using strategy prompts.
江湖论剑 — 武侠题材的 AI 智能体对战网页游戏。玩家不直接操作角色,而是写一段策略提示词(也可用 Claude Code、Copilot 等生成),由 AI 代理逐回合执行战斗决策;含 1v1 天梯、多人副本、宗门群战三种模式,对局可回放

A browser color memory game where you match hidden shades using HSL sliders and score 0–10.
ToonTones — 浏览器颜色记忆游戏,观察隐藏色后用 HSL 滑块还原,五轮给出 0–10 分,支持每日挑战和排行榜,无需注册下载

Multiplayer game where you challenge friends to real-time AI-judged courtroom battles.
revolt2tech · HN
Challenge a Friend to Real-Time Multiplayer AI Court Battle – Wram.chat

Realtime multiplayer strategy game with dice-driven economy, secret placement, and tactical combat.
@z3roshot · X
Made up a game where chess meets dice: roll, shop, secretly place, fight. ⚄ Same deterministic engine runs the bots and the humans. Server-authoritative so nobody can peek at your hidden pieces. Built with Claude Code. Read more

Complete sentences and get a clanker score based on how predictable you are to AI.
niklio · HN
You write 8 text completions and open models score how predictable each word was too them. Predictable => clanker. You can share results with your friends. The scoring checks every word you write against the model's logprobs. Right now I'm using Llama3.1, Deepseek v3 and Qwen3 to keep costs low. I tried to calibrate it so other models (chatgpt/claude) score 100% and interesting human responses score in the 10-30% range. Totally free, no signup

A card-based battle game for learning languages.
@maxhertan · X
I vibe coded a language learning game too!

A thought-provoking sewing machine game with a competitive leaderboard.
dkhcyx · V2EX
欢迎大家体验我做的发人深省,劝人向善的精品游戏 https://cassiangroup.uk/sewing/ https://cassiangroup.uk/salvate/ 最近 codex 重置太多了,蹬不完的 token 拿来蹬游戏了 期待大家荣登排行榜

Learn math through interactive quizzes across 9 topics with an AI tutor and liquid-glass interface.
@AsedaKingVpryi · X
Check out what I just built with Lovable!