are these 2 cats upstairs needed in this level for anything?
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I used them to get the star, but apparently you figured out a way to do that without them.
But yes, they do have another purpose - it's related to a game secret. There's a hint in room 12,20 about this (if you've managed to read all the messages there and figure out which direction to read them in), and room 10,12 provides a bit of a clue as well.