creep is building something like this:

0,1,2,3,4,5
1,2,3,4,5,6
2,3,4,5,6,7
3,4,5,6,7,8
4,5,6,7,8,9

but with a small amount of random noise on each value. Once done, it flips and transposes randomly the resulting matrix

about the big numbers, you'll need the same data structure I used to handle that properly. You can keep your current approach and add that structure, to avoid to the h-=1 thing (that is what's slowing your function)

(note: if you reply here, be careful about the info you write: no spoiler flag in the kumite comments)

Are you using some global var?

Read this: https://docs.codewars.com/training/troubleshooting/ see if it helps.

And it is, make sure you're not reading the logs wrong. Also note the tests are shuffled every time, so that test won't always be the fifth.

Hi man !
In fact, it's impossible to had error, because you need to complete test for validating kata !
If you don't find good solution and need help, let's ask !