yep... And at least 95% of the users who solved that kata did exactly like you... ;)

the description is not very good about that and the tests are even worse: almost everybody does that mistake and "all" solutions pass. Eiother someone already updated your language or you really ran out of luck. But there it is:

Password system comprises of n x n keypad (n>0).

The grid might not be square.

and that's actually correct.