The Muddy Children Puzzle is a puzzle about knowledge and ignorance that has been inspiring for the development of epistemic logic. Who came up with it first? This is unclear. We trace the origin of the Muddy Children Puzzle through logical and literary publications over the past two centuries. The puzzle inspired a numerous variations such as involving numbers or coloured hats. We also present a novel hats puzzle involving self-reference.

翻译：泥孩子难题是一个关于知识与无知的谜题，它对认知逻辑的发展产生了深远影响。那么，是谁最先提出了这个谜题？这一点尚不明确。我们通过梳理过去两个世纪中逻辑学与文学领域的出版物，追溯了泥孩子难题的起源。这一谜题衍生出了众多变体，例如涉及数字或彩色帽子的版本。此外，我们还提出了一种涉及自指的新型帽子谜题。