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Unlike other puzzle books, each page is involved in solving the book's riddle. Specifically, each page represents a room or space in a hypothetical house, and each room leads to other "rooms" in this "house". Part of the puzzle involves reaching the center of the house, Room #45 (page 45 in the book), and back to Room #1 in only sixteen steps.
The first three volumes of the series were originally released as "Usborne Solve It Yourself". Each book contains a vividly illustrated story, with a plot-related puzzle to solve on each double page. The series's success inspired the creation of three related series: Advanced Puzzle Adventures, Young Puzzle Adventures and Science Puzzle Adventures.
If the car is behind door 2 – with the player having picked door 1 – the host must open door 3, such the probability that the car is behind door 2 and the host opens door 3 is 1 / 3 × 1 = 1 / 3 . These are the only cases where the host opens door 3, so if the player has picked door 1 and the host opens door 3, the car is ...
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There are two doors, each with one guard. One guard always lies and the other always answers truthfully. One door leads to the castle and the other leads to 'certain death'. The puzzle is to find out which door leads to the castle by asking one of the guards one question.
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Jodi Jill, a puzzle enthusiast started giving away free her Brain Baffler puzzle in the magazine Official Freebies for Teachers. [5] Before long, there were people asking for free puzzles year around. So she decided to only send out free puzzles one day a year, on her birthday, January 29. By 1994 this was observed as National Puzzle Day. [6]