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Title: How does it do that
Review: I purchased this puzzle for my 3 year old grandson as a birthday present. He took all the pieces out and when he put the last piece in, it blue the siren and the fireman talked. Then he had to find if every piece did that. So he lifted up every piece one by one. It took him 15 min. to find out how the siren blew. He saw every piece had a sensor in it.The puzzle works just the way it supposed to. It is well worth the money. I wish I would have purchased it when he was 2 instead.
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