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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →DOOM CAPTCHA asks you to play a short browser-based DOOM level and kill at least three monsters. It is a memorable gaming novelty, not a validated way to protect a website: the project presents itself as educational and entertaining, and Ars Technica reports that it is not secure for real-world verification.
How does DOOM CAPTCHA work?
The project runs a minimal Doom port compiled to WebAssembly with Emscripten. JavaScript provides the CAPTCHA interface and receives events from the game’s C loop, including notifications for player birth, player death, and enemy kills. The project also describes automatically bringing the player back after a delay.
The challenge is configured to start at E1M1 on Nightmare difficulty, with fast enemies. The page lists arrow keys for movement and the space bar to shoot. Its goal is to kill at least three enemies. The project page describes it as “A CAPTCHA that lets you play DOOM® to prove you’re human (for educational and entertainment purposes).”
Do you really have to kill three monsters?
Yes. The current project page specifies a threshold of at least three enemy kills. That is the challenge’s stated goal, not evidence that completing it reliably distinguishes humans from automated traffic.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
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Is DOOM CAPTCHA secure?
No. Ars Technica says the demo is not secure and should not be treated as a real website verification method. The available project description and coverage do not report an independent security audit, bot-block rate, human completion rate, or benchmark. There is therefore no measured basis for claiming it provides effective bot protection.
Accessibility is likewise not established. The documented controls are keyboard-based, but the project page and coverage do not provide a formal accessibility audit or evidence about usability for people with different access needs.
Rank #2
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Was this the first DOOM CAPTCHA?
No. Guillermo Rauch, Vercel’s CEO, created the version covered in January 2025 using Vercel’s v0 site builder, according to TechCrunch’s January 1, 2025 report. Ars Technica’s January 2, 2025 coverage notes that Miquel Camps Orteza had published an earlier, DOOM-adjacent CAPTCHA in 2021. Ars reporter Samuel Axon said he needed several attempts to complete the 2025 challenge; that is one person’s experience, not a completion-rate study.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What does the project say about DOOM’s rights?
The project page says its build is based on the shareware version of DOOM and identifies DOOM as an id Software trademark. Ars Technica cautions that open-source game code does not automatically give the original sprites and textures the same rights status, and describes the legal situation as uncertain. Those statements do not establish the rights status of every asset or settle the legal position.
Quick Recap
Best Value
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Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
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Rank #3
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- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
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