This week, Matt learns that Koopa cakes exist and are horrible, Chris comes across the most incomprehensible puzzle yet, and one brother gets what could be the darkest ending in the book!

Also, Matt challenges Chris to a Young Readers round of the Synonyms! quiz, the brothers play Finish It! Makes a Video Game, Matt chooses not to do some plumbersteinian calculations, a new First Sentence song appears, and he who hesitates is lasagna!

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Original illustrations by Josie Koehne