Show HN: Cerno – CAPTCHA that targets LLM reasoning, not human biology
by plawlost on 3/31/2026, 7:22:58 PM
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'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's impossible on mobile/trackpads, but I couldn't do it with a mouse either :(
3/31/2026, 8:16:24 PM
by: CoUHKT57BSe
I'm assuming this is an april fools joke... cause it just don'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'm doing when my finger coveres the screen
3/31/2026, 8:53:23 PM
by: ravenical
Is the idea that if you /pass/, you're an AI?
3/31/2026, 8:20:11 PM
by: 1attice
Did not work for me (kept getting "something's not right") 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
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3/31/2026, 8:24:07 PM
by: mercatop
[dead]
3/31/2026, 8:47:55 PM