Thanks, I solved it!
You need two alive cats and one dead cat in the lower part.(2 cats are required in the bottom room)
P.S. By the way, I played my level of updated version but couldn't solve the last map(it should have a solution). Difference from original version is the amount of spikes. I recommend original one. (Editing starting point enables you to play only the last map) If you wanna try updated one, do so.