
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

Play Yahtzee against an optimal AI to test your strategy intuition.
@afotherg · X
I vibe coded an optimal yahtzee game. See if your intuition is the right move. Repo at with acknowlegements

Write a bot and watch it compete against others in real-time battles.
@hoofader · X
Get ready for robots age:

Calculate optimal team compositions for Anime Last Stand with this interactive strategy calculator.
Anime Last Stand Calculator — Anime Last Stand 游戏计算器,帮助玩家快速做出组队策略。

Play 7 Takes, a card game of nerve and memory, against an AI dealer.
u/termicrafter16 · Reddit
A friend taught me a Slovenian card game two days ago. GPT-5.6 Sol helped me turn our argument into an AI opponent. Two days ago, a friend taught me Sedmice, a traditional card game we play in Slovenia. The rules are simple, but we quickly got into an argument about the best moves. Naturally, I decided the reasonable way to settle it was to build an AI opponent. I wrote out the rules, project specification, architecture, and implementation details, then handed the logic to GPT-5.6 Sol. Ab

Play a strategy game about the AI race where you govern the US or China through 2030.
micstradev · HN
I made a strategy game where you play the US or China through the AI race, 2026 to 2030, sixteen quarterly turns in the browser. One run takes about half an hour. At the start, the game seals two dice you never get to see. Inside: how hard alignment really is, and how fast takeoff compounds. You get eval reports, but only as ranges, and they flatter you most exactly when your systems are least aligned. At the end you get a debrief which shows what your evals said each quarter and also what was actually true. I lost every run I played myself so far. Every number in the game is source-backed or a labeled design choice. Some of them are wrong somewhere. There is an issue template for challenging a number with a better source, and the better source wins. No accounts, no tracking, no server, works offline after first load. AGPL, nonprofit. Cards and parameters are plain JSON. Contribution is possible without writing code. Would like to have your thoughts if it is fun to play, how you lik

Create and evolve mythological entities through simulated breeding and genetic rules.
@epcccc314 · X
受启发于希腊神话中的Eros 我基于哈希码和简化的遗传原理做了一个用来记录随便的神话故事和繁衍历史的网站,可以随意的创造,繁衍,以及让存在消亡或者复活,这些都在记述者的笔下和众口之中。所有都建立在哈希值之上命定之物,只有记述是任意的。欢迎大家来玩儿~

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

Roll dice to randomly select tasks from your to-do list and overcome decision fatigue.
@RealRandomTask · X
Stuck on bored tasks? Roll the dice.

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

Install solar panels, earn Watts, and raid rivals in a shared pixel world.
@PanelWars · X
We are building a battle field. Come play. ⚡️⚡️

AI decision workspace where agents debate choices and generate roadmaps, documents, and working artifacts.
@getazrivo · X
Building - an AI assistant that doesn't just chat, it ships. Plan Mode maps out multi-step builds and produces real artifacts: live web pages, documents, spreadsheets, slide decks. It can also assemble a curated team of specialists to debate decisions.