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You have to puzzle out the "trick," so that makes it a puzzle. Reminds me of a Superman Comic book I read in either the late 50's or early 60's. An alien race is testing Superman (the reason I don't remember, could have been to see if the human race would be destroyed or not...) and they put him in a small iron bar cell with a locking door. He is told he can't use his powers to break out, and there are no trick openings. They put the key in the lock and turn it, and remove the key. He must figure out how to get out to prove he is intelligent. This is in the same vein.
How to make Infinity Mirror Clock
I wonder if something similar could be worked for feeding feral cats...
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