Nice! Would be nice to see your progress over time (if you got better, also as a function of speed...)

Great idea! Have you considered storing triplets <range, correct number, selected number> for each try and making image plots of these (x/y coordinates are correct/selected numbers, color of each pixel represents frequency) for multiple users for each range? I think the image might reveal interesting properties of human eyeballing, like near-perfect accuracy around 50%, but with less obvious correlations.

0.11% by luck, because I actually got lucky the target number was too close to zero, out of a big scale.

I love these kind ones! Really engaging also yes as someone commented, the training mode would be an awesome idea.

Also, I tried this on laptop as well as my phone, I liked it more on my phone (I know the whole point is about precision though)

I didn't think I'd be any good at this. What I didn't expect is how wildly inaccurate I'd be on every single goddamn attempt lmao it's like I completely lack whatever part of your brain is required to do this

Well I suck.

Cool idea, love how simple it is. Minimal and clean.

This is fun but you need to put "click the line" higher on the page. It took me a while to figure out what I was looking at.

Definitely need an iOS version! An angle version on a circle would be nice too.

10 round avg 4.5%.

A time limit would make sense imho. For extra challenge, add diagonal or curved lines.