Originally posted by polocatfan:

Hard Level 68 appears to be impossible.
.

All levels are possible, you just need to think outside the box,
try to count how far a line or column would go.

Every time I see one of these comments, I have to wonder if it was one of the puzzles I struggled with. My first clear was 4:42. I just cleared it again in 5:20. Getting some of the inside spaces can be a little tricky, certainly, but it is definitely doable.