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Show HN: Cerno – CAPTCHA that targets LLM reasoning, not human biology

by plawlost on 3/31/2026, 7:22:58 PM

https://cerno.sh

Comments

by: iwalton3

Unfortunately it didn't work for me with my trackball mouse. I tried multiple times. This is very likely also problematic for accessibility without another verification pathway, as assistive devices and screen readers would fail the heuristics too.

3/31/2026, 7:58:21 PM


by: dcliu

Interesting idea but it didn't accept me the first 3-4 times I tried to draw the path on laptop trackpad - going slow led to it failing before I was finished, going fast led to messy paths that were rejected as well. Could something like this work for users with different levels of dexterity?

3/31/2026, 8:10:32 PM


by: kccqzy

I am on a mobile device and I consistently find that my finger is not precise enough to draw a path; it kept complaining about path “not quite right” where my path just touched the wall a little bit. And when my finger literally obscures the screen while drawing, it essentially means I have to memorize an entire path before beginning.<p>This requires significant spatial thinking skills and short-term memory for a human and it is absolutely unfair for a human to expend that much cognitive power to access a website.

3/31/2026, 8:12:33 PM


by: opem

this game is a rage bait! Try solving on a mobile device. I don&#x27;t think an elderly person would ever be able to get through this!

3/31/2026, 7:48:54 PM


by: simlevesque

I did it correctly with a mouse and was rejected. Then I drew a straight line and was rejected. Then I closed the tab.

3/31/2026, 8:23:10 PM


by: happytoexplain

Everybody is saying it&#x27;s impossible on mobile&#x2F;trackpads, but I couldn&#x27;t do it with a mouse either :(

3/31/2026, 8:16:24 PM


by: CoUHKT57BSe

I&#x27;m assuming this is an april fools joke... cause it just don&#x27;t work at all as a CAPTCHA.

3/31/2026, 8:20:02 PM


by: _diyar

I‘m as confused as the other commenters, especially since it‘s unusable on an iPad.

3/31/2026, 8:22:14 PM


by: DHolzer

like the idea, but i cant see what i&#x27;m doing when my finger coveres the screen

3/31/2026, 8:53:23 PM


by: ravenical

Is the idea that if you &#x2F;pass&#x2F;, you&#x27;re an AI?

3/31/2026, 8:20:11 PM


by: 1attice

Did not work for me (kept getting &quot;something&#x27;s not right&quot;) but I applaud the concept.<p>I worry a bit about accessibility but that is a problem all CAPTCHAs have

3/31/2026, 8:52:51 PM


by: ceayo

am i a robot or is this just way too hard?

3/31/2026, 8:32:02 PM


by: Surac

Does not work on a touchscreen. Can’t see maze under finger and smh it always kicks me in the middle of the drawing

3/31/2026, 8:29:13 PM


by:

3/31/2026, 8:24:07 PM


by: mercatop

[dead]

3/31/2026, 8:47:55 PM