Hack Arena

Capture the Flag

Hack Arena launched on April 12, 2025 with 7 votes.

What it does

Cybersecurity Competitions, Capture the Flag

Google Capture the Flag 20172017 · security.googleblog.com · ▲152
Google's 2nd annual worldwide security competition
Hacktivate2025 · apps.apple.com · ▲139
A capture-the-flag game teaching real cybersecurity skills
CH
Code.hackmit.org – Software for Hackathons2016 · code.hackmit.org · ▲140
Game of Hacks2014 · ▲72
Test your application hacking skills.
Hacker Experience2014 · hackerexperience.com · ▲96
Online hacking simulation game
Major League Hacking2014 · mlh.com · ▲102
Find and compete at the best student hackathons in the world

SimCity, but with Permits▲939
A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.
Life & fun · 7d ago · permit.petercai.com
IV
I've been paying for a rural Tanzanian's education for 10 years▲778
Life & fun · 19d ago · tanzaniaeducationproject.org
Bigwords.page – Turn any screen into a sign. The URL is the app▲728
Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.
Life & fun · 20d ago · bigwords.page
Steal My Bitcoin▲617
A PHP security challenge. Find the hidden bitcoin key. First person to get the wallet wins.
Life & fun · 3d ago · stealmybitcoin.com
Guitoro, a virtual guitar you strum with your keyboard▲573
Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.
Life & fun · 14d ago · guitoro.com
Product Hunt Visual Launch Editor▲443
See your launch as you build it
Life & fun · 5d ago

I built a hardware processor that runs Python▲983
Hi everyone, I built PyXL — a hardware processor that executes a custom assembly generated from Python programs, without using a traditional interpreter or virtual machine. It compiles Python -> CPython Bytecode -> Instruction set designed for direct hardware execution. I’m sharing an early benchmark: a GPIO test where PyXL achieves a 480ns round-trip toggle — compared to 14-25 micro seconds on a MicroPython Pyboard - even though PyXL runs at a lower clock (100MHz vs. 168MHz). The design is stack-based, fully pipelined, and preserves Python's dynamic typing without static type restrictions.…
Dev tools · 2025 · runpyxl.com
Unsure Calculator – back-of-a-napkin probabilistic calculator▲930
The Unsure Calculator is an online tool that lets you calculate with numbers you’re not sure about.
Life & fun · 2025 · filiph.github.io
I built an AI that turns GitHub codebases into easy tutorials▲923
https://the-pocket.github.io/Tutorial-Codebase-Knowledge/
AI · 2025 · github.com
Whatting▲898
The iPad diary, just for you
Work · 2025 · whatting.com
Strawberry▲859
Browser with AI companions that automate web tasks
AI · 2025 · strawberrybrowser.com
Peek▲828
AI personal finance coach that guides you through decisions
Work · 2025 · peek.money