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Here are some things you could try: Rebus A rebus is a puzzle device that combines the use of illustrated pictures with individual letters to depict words and/or phrases. You can draw the pictures on Paint or something similar but a popular device I've seen recently is to use emojis to represent TV shows, movies, songs, etc. For example the following is a TV ...


24

At least not if the solution space is a countable infinite set, or smaller. In that case, we can compute the finite time person 2) will need to find the solution found by person 1) by enumeration, making the strategy of 2) a computable function and therefore violating the constraints of the question. Response to edit: The "does not have to be perfect-...


21

My friends and I did quizzes for about four months, and these are my favourite rounds we did that fit your criteria: Bad film reviews There are aggregated lists of film reviews that are baffling and terrible - read your friends the review, and have them guess which movie it's for. Q: Why is he wearing jeans in the ocean? - 1 star A: Aquaman Specific ...


11

You will never be absolutely sure that no one cheated, but when I've done these, I made the prizes to not have enough monetary value to bother. Like top prize was a $25 amazon certificate. Big enough to make it interesting, not big enough to be ruthless. I state the rules up front -- no electronics, no Google, using the honor system. If you're worried ...


10

No. If there is exactly one way to fill out the grid in a valid way, then that can be found without using any logic based on uniqueness. (It may be very painful, and require brute-forcing a lot, but it won't be impossible to find.) If there are exactly two valid ways to fill out the grid, then uniqueness logic cannot help you. You can never make a deduction ...


8

There is a simple, almost trivial way in which the conditions can be satisfied. The smallest example of this works on a 3x3 grid. The board looks like this: with the pieces Result: You can use a similar domino arrangement as part of a larger board. It is of course very easy to avoid the dead end solution, cause the vertical domino would normally be placed ...


8

Find any integer $n$ such that $n$ is the number of solutions to this puzzle.


7

I know this question has already been answered (and in a better way than I could ever have!) but I feel like it is worth bringing up the generic category of puzzle "Knowledge Puzzle" or "Induction Puzzle", which kind of fits the original description. (This category includes problems like the "coloured hats" puzzle group, and ...


7

One strategy would be to allow Google searches. Then write questions that you need to know trivia to know what search terms to use. Or let them solve that problem for you. Have them write the questions. If you want to avoid them just writing ridiculously hard questions, you can have a Dixit-style scoring system.


5

Note, if you are having a hard time relating the solution below to the question. That is because of OP's extensive changes to the question. Originally, heavy diamonds were 101g and light ones 100g.


5

While you can't use any of the ones that have already spread online, you can take inspiration from memes/hashtags like "Describe a film poorly" since a lot of the fun of the meme is in avoiding any of the words that would normally appear in an explanation of the plot. But if you can make up your own, then you can put forward clues like "...


5

I believe what you are asking is, "how can I go from a set of categories to drawing a grid"? I will demonstrate how to do this in two ways. Purpose of the logic-grid set up First, let us establish the purpose of the logic grid. All categories intersect, but only once. This allows any information relating any categories to be marked down in a ...


4

If you're scared of clowns, don't click the spoiler :D You can use this tool and import your 2nd image to generate the above http://magiceye.ecksdee.co.uk/ Once imported, you can use the slider above the image on the website to fine-tune it. I knew of this tool from this subreddit where you can find images that uncover something hidden if you manage to ...


4

If you're looking for some inspiration for making your own puzzle with this mechanism, I can think of two past examples right now (warning: spoilers for the mechanisms for these puzzles!): Foreign Box Office (from MIT Mystery Hunt 2020): This puzzle involves finding pairs of false friends (words which are spelled the same but have different meanings in ...


4

A fundamental issue with hosting a 'trivia' contest online, is that when players have the ability to search the internet for answers, information being obscure isn't enough for it to make a good question. Also, typing into Google isn't the only issue you're facing - the two examples provided in the question can be cheated through reverse image search and the ...


4

Statue Park clues all give the same amount of information: there is a tile here/there is not a tile here. But depending on their location, you can get a different amount of information! To demonstrate this, consider this puzzle (where the piece bank is the pentominoes). Say I've already determined the two shapes I've shaded in. If I want to place a clue at ...


4

glad you're interested in the Density™ puzzles! :) The way I generated the original versions of the puzzles was to use MS Paint, create a bitmap of 72 x 72 pixels and then use the pencil tool, set to the smallest size (should be 1 pixel) to fill in the puzzle. Once that's done, zoom out so that the bitmap is reasonably sized, then use the Snipping Tool (or ...


4

My baby has grown into a toddler, so I decided to sell her little frilly dresses on Facebook. They were bought by a mother of twins for her baby/ies. She told me that her twins aren't identical, but I forgot to ask if they are both girls. What are the odds they are?


3

Is it possible to construct a puzzle that is: Solvable if you assume there is a single unique solution Not solvable if you do not make this assumption How about this one: Given a function on the natural numbers, $F: \mathbb N \Rightarrow \{0,1\}$, such that the probability that $F(n)=1$ is $2^{-n}$, find all $n$ such that $F(n)=1$. If you assume there is ...


3

Whereas the question has already been answered, here is a corroboration on answering it with "yes", by providing a minimalistic mathematical example. Many non-linear relations contain one or multiple points with unique characteristics or singularities, which you can exploit in such a riddle. Consider for example a parabola $y=x^2$. Find me the ...


2

Puzzle I: Uisng standard set theory $\mathsf{ZFC}$ (i.e., the Zermelo-Frenkel axioms, including the Asiom of Choice), find a set $x_0$ such that $\phi(x_0)$ holds, where $$\phi(x)\equiv (\mathsf{CH}\leftrightarrow x=\emptyset). $$ Here, $\mathsf{CH}$ is short for the continuum hypothesis. You cannot solve this puzzle, i.e., you cannot exhibit any concrete ...


2

I'm interested in the community's take on this trivial example using Tapa rules: 2 3 2 _ _ _ _ _ _ _ _ _ 2 3 2 Basic rules force the second and fourth rows to be all shaded. For either side of the middle row, one could argue that shading that square leads to multiple solutions, but you cannot make that argument for the middle square. So there is a ...


2

Posted here by user @bof on Chess Stack Exchange: Under the specific rules of this question, Re7++ and Rc5++ don't count (or do you mean they don't count as two checkmates each?), so that would be 103.


2

No proof of optimality, but for the record, I have a solution for


2

REVERSE TRIVIA You provide an answer to trivia question, and ask your participant "What is the question for this answer?" You can tune the obscurity of the 'answer' so that participants can come up with the questions. To limit possible (and perhaps correct, but unintended) questions, you can narrow down by category, year, or other hints. I find it ...


1

I think trying to get a lenticular plastic sheet printed with the exact correct spacing would be really difficult. However, if you could get the paper sheet as flat / straight as possible and scan it on a flatbed scanner, it would be reasonably easy to write a Python program or similar that cancelled out the straight lines and enlarged any deviations from ...


1

If you're doing "local" clues, indicate it somehow In other words, yes it is fair to use "quetzal" for Q if the crossword has a Game of Life or cellular automata theme (preferably with the fact that there is a theme called out somewhere). The solver is primed to be thinking in that direction. Thus using "locale-specific" ...


1

I heard about the following example of non-rational problem solving. A dog holds a stick in his mouth. He wants to pass beween the bars of a fence. How can he do it? I am sure you can explain the solution in very rational terms. But the way people find the solution is by just "seeing" the solution.


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