I was struggling to find 1 cat on floor 5 and even when using the hint button, it didn't help because I was looking in the wrong spot when it lit up. I just think it would be a lot better if the hint spot stayed lit or have a trail of light fly to the location of the cat instead of forcing you to look around the whole area and wait for the hint to recharge again if you miss it. I actually thought the missing cat was an error and deleted my save only to get stuck on that 1 cat again. Only after being told where it actually was did I realise that had I looked in that one spot, I would have seen it light up, but it's not helpful when you're staring at the couch for example and it's not close enough to see it light up even in your corner vision. I did end up completing it though; it just took some extra time.