Unanswered Questions
19 questions with no upvoted or accepted answers
10
votes
1
answer
751
views
Powerful number systems
Imagine I have two positive integers, $a$ and $b$. Can you find the last digit of the sum $a+b$ given only the last digits of $a$ and $b$? More generally, can you find the last $n$ digits of $a+b$ ...
CommunityBot
- 1
10
votes
0
answers
509
views
I'm a number with a special product, so name me when you think you've got it
In the blocks that come before,
their special product tells us more.
To guess my scheme you'll need calculation,
but only little tests of recreation.
Each block contains atoms strong as Thor,
...
- 2,296
9
votes
1
answer
2k
views
Is there another name for this puzzle? (Kyudoku, Nine Find)
Is there another name for this type of puzzle? I can only find two examples of it online:
https://www.brainzilla.com/logic/kyudoku/
http://ninefind.com/
In the game you start with a 6x6 grid filled ...
CommunityBot
- 1
7
votes
1
answer
1k
views
Name and solution of puzzle to rotate all arrows to same direction
In this puzzle, when you click an arrow, all arrows immediately next to it (diagonally included), as well as the arrow you clicked itself rotate 90 degrees. The goal is to get all the of arrows to ...
CommunityBot
- 1
7
votes
0
answers
312
views
Even and primes puzzle?
These are secret numbers that increase regularly. What are the next two numbers?
If you like numbers, it will be fun.
$2^3 \times224299$
$2^2 \times 3^2 \times 19 \times 3557$
$2 \times 5 \times ...
- 6,581
6
votes
0
answers
289
views
Trying to find a 2020 puzzle hunt with a puzzle based on Among Us
I am trying to find a puzzle hunt that I believe was held in 2020. It contained a puzzle based on the game Among Us with 26 characters, and you had to decide who were the imposters. The imposters all ...
- 10.4k
6
votes
0
answers
314
views
Looking for a kid's puzzle, cannot remember title
I'm looking for a kids' logical puzzle I saw in a Brazilian puzzle magazine several years ago. A farmer had a square farm with four houses and twelve trees and he wanted to divide it between his four ...
- 35.6k
6
votes
1
answer
502
views
Late 18th/early 19th century numbers grid
I was researching an historical figure on the Isle of Man, Capt George Quayle (b.1751 - d.1835), and in amongst the museum's papers was this numbers grid which was part of his effects. The museum ...
CommunityBot
- 1
4
votes
0
answers
163
views
Wooden puzzle with multiple balls on strings attached to a central hook, from which metal arms connect top and bottom
I bought this puzzle few years ago at a market. I couldn't solve it since. I started to think it was wrongly assembled, therefore can not be solved. Tried to find the solution on the internet/YouTube ...
- 10.4k
4
votes
0
answers
250
views
Is there a name for crosswords where the surface of the vertical clues resemble the solutions to the horizontal and vice versa?
Occasionally a crossword (often cryptic ones) would have a twist to them, such as being a 'nina':
A Nina is a special feature of the crossword grid: a word, words or phrase hidden within a pattern of ...
- 6,000
4
votes
0
answers
348
views
Do minecart puzzles like this, with buttons that rotate track, exist?
This is the end result of me messing around with minecarts and moving floors.
The buttons change the orientation of either their nearest or their same-color track. Now I'm not asking you to solve the ...
- 143
4
votes
0
answers
417
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
3
votes
0
answers
165
views
encode in encode
Today, a cryptic message was received by Area 51:
Bananatexteismarvellous605185682252125223459314283216133301
2
The staff managed to figure out that some 2 digit ...
- 31
2
votes
0
answers
186
views
Do puzzles like "write 120 using four 8" have a specific name?
Here on puzzling SE there is the category "calculation puzzle", but it's very broad. I'd like to know if somebody gave a specific name for such puzzles.
- 10.4k
2
votes
0
answers
191
views
What is the Name of this Toggling Puzzle?
I came across an interesting toggling puzzle while looking through a code repository on GitHub. I want to find out more about it and see if there is any info on how to solve it, how to ensure ...
- 10.4k