61

I am ashamed this came to me so quickly.


34

This type of puzzle (typically called the missing dollar puzzle in this case) is referred to as an informal fallacy puzzle. The general idea is that the logic that is presented to the user appears at first glance to be correct, but in actuality has an error in it. In this case, the 9 spent by his father and 9 spent by his mother together equal the 17 spent ...


26

The magic trick is as follows. Source. Explanation:


24

After searching around, going through Hungarian Rings, I finally stumbled on Radosza's Rings, which seem to be educational toys. Link


22

I think the most-common definition of a logic puzzle is one that requires the solver to make deductions using formal logic, like the famous Einstein's puzzle. With this type of puzzle, you use only formal logic to come to conclusions. e.g. Given: If A, then B Given: If B, then C Deduction: If A, then C (I'm no expert in formal logic, so the example is ...


20

This indeed is an old puzzle. One possible source (but certainly not the first one) is: Andy Liu: Two Applications of a Hamming Code The College Mathematics Journal 40, (Jan 2009), pp. 2-5 The trick on the $2^k\times2^k$ board is to associate each of the $2^{2k}$ squares with a unique binary number with $2k$ bits. (Note that the number of squares ...


18

Given that there's little context, it's hard to give a definitive answer, but I'd have to guess that the answer you are looking for is: This can be found by:


16

Borrowing language from fuzzy set theory, what you have is a crisp, binary decision imposed on a set of more than 2 values, at least one of which is fuzzy. Let me explain. Your friends implicitly assume that puzzles can be crisply partitioned into logic and non-logic puzzles. This is not the case. There are at least 3 types: puzzles fully answerable by ...


15

Good answers, but... I've seen two valuable solutions for this puzzle: The answer given by Gamow, which is, in my opinion, the best solution if you want to implement the algorithm in some programming language, but it's not very good/intuitive for the two members of The prodigious Duo (converting so many numbers to binary and XORing all that data isn't an ...


15

Persons A and B are trying to draw a semantic distinction over language that is intrinsically ambiguous. As a result, neither of them are wrong. If you want to have an argument of whether a puzzle is one of logic or not, you first need to clearly define what counts as "logic," and subsequently, what counts as a "logic puzzle." Neither of these things ...


15

For the muddy children variant of this problem, there are several earlier sources. For instance, A.A. Bennett (Problem No. 3734, American Mathematical Monthly 42, 1935, page 256) formulated the following version back in 1935: A car with $n>2$ passengers of different speeds of mental reaction passes through a tunnel, and each passenger acquires ...


15

The answer is: First row: Second row: The elements are:


15

Looks very similar to Simon Tatham's "Net". The goal is to get everything connected together; the operation you're allowed to do is to rotate each square by any multiple of 90 degrees.


14

Let the number of cells in the board be $2^k$ for some $k$, and number each cell from $0$ to $2^k-1$. In step 4, during the "look closely and meticulously at the checkerboard's configuration" part, Leonardo decides which piece he will flip. This is before the audience member makes his choice. For each integer $i$ from $1$ to $k$, Leonardo will count how ...


13

The puzzle that matches the one in the image is called The Snake cube. http://www.mathematische-basteleien.de/snakecube.htm


13

My guess would be Explanation: First green and then yeller, (sic. yellow) All guts and no tallow.


13

As answered by @BeastlyGerbil, you have the world of twisty puzzles. Here in the Twisty Puzzle Museum you can find over 5,000 of these kind of puzzles, and here is my personal collection of currently 279 puzzles (pictures are a bit outdated though, since I now have a few more shelves; list is up-to-date however). That being said, you gave the following ...


13

This type of puzzle is called a burr puzzle. This particular one was designed by Bill Cutler, and is called Wausau '83. It is produced by Jerry McFarland, and available from Bill himself, or from Mr Puzzle in Australia. There are some blogs that review the puzzle, for example here and here, but few solutions to be found. The only solution I came across was ...


12

Kevin Cruijssen gives some good examples. You might also want to consider multiple layers as a part of the puzzle, which allows you to have additional constraints, either visible or hidden. For example, "One Fish, Another Fish", where the frame and piece shapes constrain movement I highly recommend looking at Rob's Puzzle Page ( http://robspuzzlepage.com )...


11

In the online realm, these are known as "hidden object/picture" games, and the definition also matches those which appear in books. From Wikipedia (emph. not mine): A hidden object game (sometimes called hidden picture) is a genre of puzzle video game in which the player must find items from a list that are hidden within a picture. In essence, "Where's ...


10

My younger brother likes magic and so I recognize the boat. The boat + the tokens is already a set, everything else is from another trick. The trick is that you magically place the same sequence of images as a volunteer. There are two tokens of each image and there is a trick token which is black on both sides and looks like the bottom of the holes. I ...


10

That specific one looks like a Varikon tower to me. See http://www.cs.brandeis.edu/~storer/JimPuzzles/MANIP/VarikonTowers/VarikonTowers.pdf http://www.jaapsch.net/puzzles/tower.htm


10

BIT = 1011000 and the mathematical equations makes this look a lot like binary is involved. Combine that with the hint that the title is important, and we can work out where BIT=1011000 comes from: Knowing that, we can then convert all of the other equations to binary: Solve those, and we get a list of numbers: Numbers <= 26 can be converted to letters ...


10

The riddle series you were looking for was Tricky's Riddles. It's an old puzzler that I myself came across in 2006 back when a bunch of my middle-school friends introduced me to it, and back when it didn't have a domain and was still being hosted in a University of Exeter home directory. Looking back at it, the riddles were really shoddy and much too "random"...


10

Easy


10

The earliest occurrence of the puzzle that I am aware of is from 1958. George Gamow and Marvin Stern: "Puzzle Math", Viking Press (February 7, 1958) Here is the Amazon page for this book: http://www.amazon.com/Puzzle-math-George-Gamow/dp/0670583359 Chapter 1 of the book contains several mathematical puzzle stories on the great Sultan Ibn-al-Kuz of ...


10

Possible answers for the non starred ones: a. You b. So c. So d. e. f So g So Now for the starred ones: h It was actually: i It was actually: j Or (thanks @Silenus) It was actually


9

It's called Bridg-It, or Game of Gale (as it was invented by David Gale). It is the rectangular grid equivalent of the Shannon switching game, which is a generalized version of Hex.


9

"Egyption Prediction" YouTube video "Egyptian Prediction" & other magic tricks (How-To) PDF


9



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