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DOOM CAPTCHA asks you to play a short browser-based DOOM level and kill at least three monsters. It is a novel game-and-CAPTCHA demonstration, not a proven way to protect a production website from bots.
What is DOOM CAPTCHA?
DOOM CAPTCHA turns a familiar game into a human-verification challenge: visitors play a brief DOOM level in their browser, with the current project page setting a threshold of at least three monster kills. The creator describes it as “for educational and entertainment purposes,” not as a validated security product. Official DOOM CAPTCHA project page
How does DOOM CAPTCHA work?
The project says a minimal Doom port is compiled to WebAssembly with Emscripten. JavaScript provides the CAPTCHA interface and receives events from the C game loop, including callbacks for player birth, player death, and enemy kills. The project also lists automatic player rebirth after a delay among its changes. Official project description
The challenge and controls
The configured challenge jumps to E1M1, uses Nightmare difficulty with fast enemies, and requires three enemy kills. The page shows arrow keys for movement and the space bar to shoot. Official project description Ars Technica likewise described the challenge as deliberately difficult; its reporter said they needed several attempts, an individual account rather than a measured completion rate. Ars Technica, January 2, 2025
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- ENTER THE WORLD OF SKYRIM: Experience the legendary open-world RPG as a tabletop adventure, exploring Tamriel through branching quests, iconic factions, and rich Elder Scrolls lore.
- COOPERATIVE OR SOLO PLAY: Designed for 1–4 players, allowing you to adventure solo or team up to face dragons, uncover conspiracies, and shape the fate of Skyrim together.
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Is DOOM CAPTCHA secure?
No. Ars Technica reported that the demonstration is not secure and should not be relied on to verify visitors to a real website. The sources do not report an independent security audit, measured bot-block rate, human pass rate, or benchmark, so there is no evidence here that killing monsters makes a site meaningfully safer. Ars Technica, January 2, 2025
Is DOOM CAPTCHA accessible?
The documented controls are keyboard-based, but the cited project page and coverage do not establish the demo’s accessibility through a formal audit or testing with people with different access needs. The control list alone is not enough to conclude that it is either accessible or inaccessible. Official project page Ars Technica, January 2, 2025
Rank #2
- IMMERSIVE STORY: Dive into the Mass Effect universe as Commander Shepard, leading a squad through a Cerberus cruiser to unveil secrets before a massive storm hits Hagalaz.
- DYNAMIC GAMEPLAY: Experience a unique card-driven AI and evolving story that alters based on your choices, ensuring a different gameplay experience with each session.
- DEEP CHARACTER CUSTOMIZATION: Equip and upgrade your squad, including iconic characters like Liara and Garrus, with powerful abilities and gear as you progress through the game.
- COOPERATIVE MISSIONS: Engage in a co-operative, narrative-driven campaign for up to four players, featuring optional loyalty missions that unlock special powers for each squadmate.
- MULTIPLE ENDINGS: A branching narrative with a variety of endings based on your decisions, enhancing replay value and player engagement.
Was this the first DOOM CAPTCHA?
No. Guillermo Rauch, Vercel’s CEO, created the version covered in January 2025, reportedly using Vercel’s v0 site builder. TechCrunch, January 1, 2025 Ars Technica noted that an earlier DOOM-adjacent CAPTCHA by Miquel Camps Orteza appeared in 2021, so the 2025 version was not the first concept of its kind. Ars Technica, January 2, 2025 Miquel Camps Orteza’s earlier project
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 says its build is based on the shareware version of DOOM and identifies DOOM as an id Software trademark. Ars Technica cautions that the availability of open-source game code does not mean the original sprites and textures have the same rights status, and describes the legal situation as uncertain. The project’s description does not settle the rights status of every asset. Official project page Ars Technica, January 2, 2025
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Best Value
- How to Play: Doomlings is a fun, strategic, fast-paced card game where you and your friends compete as Doomlings species for dominance on a distant planet! Play cards with unique traits and abilities to build your species and survive the end of the world
- Player Specifications: Designed for 2-6 players, ages 8+, making it suitable for adults and kids alike, as well as game night enthusiasts and families who enjoy a good laugh with a healthy dash of strategy
- Gameplay Duration and Portability: With a quick setup and 20-45 minutes of gameplay, Doomlings works well for game nights at home, on-the-go fun, or as a gift for card game lovers
- What's Included: The Doomlings vintage base game comes with 167 unique cards-no duplicates! Each card has a unique ability, making the game infinitely replayable
- Brand Story: Doomlings began on Kickstarter in 2021, created by two brothers who lost their jobs during COVID-19. It raised nearly $1M, became a top Kickstarter success, sold over 300,000 copies worldwide, and was named Teen Vogue's Best Card Game of 2024
Rank #4
- Join forces to help Frodo make his way across Middle Earth and complete his quest to destroy the one ring
- In this cooperative strategy game players will roll dice and draw cards to try and avoid the ring wraiths and save Middle Earth
- Plays up to four players or can be a solo adventure
- Playtime is approximately 50 minutes
- Immerses you in the world of Tolkein
Rank #3
- Officially licensed Borderlands products inspired by the iconic Mister Torgue, featuring tabletop game expansions, collectibles, and themed accessories
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