Using a Spell Checker, seems like "must be offset from startX and startY" is the right answer, thanks!

It's added :)

As I really want the user to allocate the memory itself because it's an interesting part of the kata, why not keeping it like it's done actually (allocation in the function, free in the tests)? Also adding instructions that the user should allocate memory by itself.

I changed the description, how do you find it?

Well we have "y is the vertical coordinate" and "{x=0, y=0} starts at the top-left", seems like it's fine like that?

It should be fine now

Both issues should be fixed, I added details about how to use scale and why.

Hey, it's added! Thanks for your feedback :)

Thanks, it's fixed.

Sorry, English is not my first language, the mistake comes from "offsets"?

I wanted the user to manually allocate the needed memory.
I didn't think about freeing the pointer, I will fix that issue.

Do you think it's useful to tell the user that they must allocate memory by themself? I though it was clear in the instructions.

Thanks, I didn't know about that! It's added.

I added more information in the description about these issues

Woops you're right - will fix.

The Wikipedia page isn't useful at all as the perlin() function is already implemented, it just serve as an explanation to what is Perlin Noise.

Are the instructions unclear? What could I improve?