
ClaySeal Arena — Prompt-Injection CTF
A capture-the-flag game where you use prompt injection to make AI agents break their rules.
yuvvantalreja · HN
I Built a Capture the Flag Arena for Agents
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A capture-the-flag game where you use prompt injection to make AI agents break their rules.
yuvvantalreja · HN
I Built a Capture the Flag Arena for Agents

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

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

Play a collection of HTML5 games online directly in your browser.
Games Hub — HTML5 游戏集合站点

Create and host live AI-powered quizzes with real-time audience engagement and instant question generation.
EZQuiz — AI 智能实时测验,让你快速创建、分享并与观众通过实时互动测验进行互动

Navigate 12 platformer levels, collect coins, and compete on a live global leaderboard.
@TRICKSTER_GAME3 · X

Analyze chess games with natural language explanations using an open-source browser tool with no login required.
u/ICARUS_2X · Reddit
Spent 7 months building a FOSS platform for natural-language chess analytics (No LLM) Hey guys, I've released CHONSE2, an open-source game review platform that offers unlimited analysis and move explanations without using hallucination-prone LLMs, running entirely in your browser. chonse2.com But Lichess is free, so why use this? Some have asked. It expands on Lichess's feature set a few different ways: Full analysis (accuracy/elo estimations/eval graphs, etc) requir

An FPS game built as a parent-friendly alternative to Roblox.
davitb · HN
I'm a father of two, 7 and 12. They are obsessed with Roblox, especially Rivals. Like a lot of parents, we did not love it. We tried the usual things: block it, limit it, set timers." It became a daily battle, a lose-lose situation. So I flipped the problem. Instead of fighting what they loved, I decided to lean into it, but with a twist. Why just play an FPS when you could build one together? My kids became the PMs. Claude and I became their engineer. I was shocked by how fast we moved. We picked a name, Cooked and started building. Get in. Lock in. Get cooked! In the first 3 hours, we had an actual FPS we could play together in the browser. Next day I invited my friend's two kids over. Suddenly, I had four PMs. We had 3 laptops, 1 iPad and 1 iPhone. So in 30mins we added mobile support and could play all 5 together. The kids would ask for features: "Can we have a rocket launcher that knocks people off the map?" "The knife should stab faster when you hold it." I know al

Free unblocked browser shooting game with arcade-style action.
Funny Shooter 2 — enjoy unblocked shooting games for free! Dive into exciting gun games with funny shooting action. Perfect for shooter game fans!

Practice intraday trading execution with hidden-date historical market sessions.
u/dodqy · Reddit
Trading Practice Platform I’ve always found it difficult to get meaningful practice outside of market hours, so I built a browser-based replay platform to solve that problem. You choose a stock or ETF, time of day, and up to three indicators, and it randomly loads a historical trading session from the past six months. The goal is to practice taking trades as if they were happening live. It includes: Basic and advanced TP/SL management AI trade reviews with a performance score after each


Combine products and buzzwords to build AI startups and sell them for portfolio income.
u/Big_Nobody_2715 · Reddit
I made a browser game where you turn a toothbrush into a billion-euro AI startup It's a free browser sandbox game. You mix products + buzzwords, build weird companies, and watch them generate income in your portfolio or sell them. Kinda like Infinite Craft but if it was made by a sleep-deprived founder who’s seen too many pitch decks. Play here: https://startup-alchemy-amber.vercel.app/ Let me know if you managed to break it Best experienced in Chrome (works fine in other browse