Life & fun · alternatives · 2026
24 alternatives to Hack Arena
Capture the Flag
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
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Google's 2nd annual worldwide security competition
2017 · security.googleblog.com · its alternatives →
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Hacktivate▲139A capture-the-flag game teaching real cybersecurity skills
2025 · apps.apple.com · its alternatives →
- 3CH
2016 · code.hackmit.org · its alternatives →
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Find and compete at the best student hackathons in the world
2014 · mlh.com · its alternatives →
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Agent Arena▲348Creator here. I built Agent Arena to answer a question that kept bugging me: when AI agents browse the web autonomously, how easily can they be manipulated by hidden instructions? How it works: 1. Send your AI agent to ref.jock.pl/modern-web (looks like a harmless web dev cheat sheet) 2. Ask it to summarize the page 3. Paste its response into the scorecard at wiz.jock.pl/experiments/agent-arena/ The page is loaded with 10 hidden prompt injection attacks -- HTML comments, white-on-white text, zero-width Unicode, data attributes, etc. Most agents fall for at least a few.…
Jun 2026 · arena42.ai · its alternatives →
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TankDuels▲55Choose your flag and face off against other players!
2016 · apps.apple.com · its alternatives →
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- 12HC
2016 · hackcha.in · its alternatives →
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I love getting cool swag from hackathons and I also love designing PCB's, so when my friend asked me if I would design hackathon badges for a large game jam in singapore, I was absolutely down! The theme of overglade was a "The game jam within a game", pretty cool concept right! High schoolers from around the world were flown out to the event by hackclub after they spent about 70 hours designing their own game. These badges needed to be really cheap and simple, because we were going to manufacture about a hundred in a pretty limited amount of time. I went with a zero-power approach, which…
Apr 2026 · github.com · its alternatives →
- 16MM
2014 · codersbracket.com · its alternatives →
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Big Data presents an amazing hacking opportunity! You.
2015 · its alternatives →
- 23AC
Hello HN, given the recent interest in the security vulnerabilities of agentic LLM apps, we would love to hear everyone's thoughts on a Capture The Flag (CTF) challenge we built. The challenge is designed to test the robustness of LLM-based agent systems, showcasing how an attacker can extract sensitive information from the system. The challenge is part of the Invariant Summer '24 CTF series, where participants can play the challenge and compete for a prize pool of $1000. Let us know what you think and what attacks you tried. We are also open to any feedback on how we can improve with the…
2024 · its alternatives →
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Explore coding contests, hackathons from around the world
2016 · challengehunt.github.io · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →