Unanswered Questions
53 questions with no upvoted or accepted answers
6
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0
answers
254
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Sequence puzzle: 3, 9, 27
A twist of the classic sequence game:
A friend asked me to find the rule to this sequence: 3, 9, 27.
I am allowed to suggest other sequences to test if they follow that (unknown to me) rule, to which ...
- 10.3k
6
votes
0
answers
375
views
6
votes
0
answers
320
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Truly unexpected thingy in a Radcliffe novel!
Ann Radcliffe was an English author in the Gothic style at the turn of the nineteenth century. Among the many interesting points in her remarkable career though, one little story is but poorly known. ...
- 5,430
6
votes
0
answers
302
views
Find the missing element?
I've been trying to solve this for quite some time, can you help me solve it?
This puzzle was made by one of my friend's teachers. This is not copyrighted and cannot be found anywhere on the internet.
...
- 41.7k
5
votes
0
answers
185
views
The sound of the end of the world
What is the sound of the end of the world? The answer is hidden in this maze.
- 301
5
votes
0
answers
223
views
"PRI" puzzle with line drawings, including some shapes
This is a "PRI" puzzle that was posted on a reddit question. https://www.reddit.com/r/cognitiveTesting/comments/1btdot2/has_anyone_got_any_hard_pri_puzzles/
- 10.3k
5
votes
0
answers
265
views
Longest Fibonacci word
Fibonacci words are defined as $F_0 = a, F_1 = b, F_{n+2} = F_nF_{n+1}$ where $a, b$ are letters. How can you find the longest Fibonacci sub-word in a given string?
Try to solve it in linear time ($O(...
- 151
5
votes
0
answers
264
views
Connect dots on a grid with one continuous line (optimization)
(This question is the third puzzle of the Connect dots puzzle series. You can find the first two puzzles here and here, respectively.
The original question and photos originate from webadventurer. ...
- 1,163
5
votes
0
answers
368
views
4
votes
0
answers
333
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Lucas's interesting cipher
Lucas was fooling around with some letters when he encoded some text into Gsobj lwmtkd sbceugb vfy rgdjb.. Can you figure out the original text he had?
4
votes
0
answers
205
views
Mr. Bean's Ridiculous Way to Work
If you saw Mr. Bean as a kid, or ever, you know how crazy and unbelievable he is. In this scenario, Mr. Bean lives in the bottom left house and works for the school at the left, but he always takes ...
- 10.3k
4
votes
0
answers
234
views
The smallest number
Some time ago I created a program to generate a table, and printed the first seven rows and columns.
Somehow however I forgot to print the headers and the title of the table.
I only remember that it ...
- 229
4
votes
0
answers
418
views
What type of puzzles are the statue puzzles in Super Lucky's Tale, and what method should be used for solving them?
This question is about a set of puzzles in the video game "Super Lucky's Tale" (as well as its Nintendo Switch remake "New Super Lucky's Tale"). They are known as statue puzzles as ...
- 299
4
votes
0
answers
187
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Problem #NaN Fodder/Output
Inspired by Ben Franks' Input/Output Problem #1 and the others in the series
Hint: Knowledge required is
- 2,395
4
votes
1
answer
561
views
Formula for the sequence 1, 1, 1, 21, 3, 1, 4, 1, 5, 1, 6, ... if the 21 isn't a mistake
The sequence 1, 1, 1, 21, 3, 1, 4, 1, 5, 1, 6, ... appeared in one of my tutorial sheets in 2019. I assumed that the fourth term, 21, was a mistake (was supposed to be ..., 2, 1, ...) then it made ...
- 10.3k