About the puzzles:
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Especially happy cats. Everyone can gather, but to gather so as to chew out what pieces the cats splashed, then find, understand from which they puzzle, smooth up the gathered so that it is not noticeable - this is the highest pilot.
So you can choose the level of difficulty: Newbie - no cats, Profi - let one cat, Master - let two cats. Guru (leaving cats in the room for the night)