Newest Questions
29,038 questions
11
votes
1
answer
929
views
longest path in 10x10 grid
This puzzle is based on a grid that contains values from 0 to 9 and wildcard *.
Find longest non-intersecting path in a matrix starting from top-left cell and ending bottom-right cell.
Build the path ...
- 1,366
8
votes
0
answers
529
views
Two popular bright rivals
Grid missing rival!
Can you figure out who's secretly behind this rivalry? Fill in the nickname accordingly in the grid.
Hint 1:
Hint 2:
EDIT:
Instead of what I've written in the hints above
- 47.8k
11
votes
2
answers
600
views
Make him shuffle most!
James is a dealer who can only use overhand shuffle. For some reason, you decide to harass on him. You know that he is playing a “stacked deck” with some player. You are also good at it, so you decide ...
- 2,712
8
votes
4
answers
372
views
Both, One, Neither… But With A Twist
There are 99 people in a building. All the people are either Agents or Jokers. You know that at least 50 are Agents (they might all be Agents).
You can point to any two people, and ask to any third ...
- 1,974
1
vote
1
answer
120
views
-4
votes
3
answers
210
views
1 22 333 4444 55555 666666 7777777 88888888 999999999
You are given the following 8 numbers:
22
333
4444
55555
666666
7777777
88888888
999999999
Answer the three following sub-puzzles, allowed operators are: $+,-,\div,\times$ and parenthesis.
Obtain 1 ...
- 6,726
3
votes
1
answer
237
views
Breakfast, socks, and diseases
This is my very own logical deduction puzzle I've created with the help of my friend.
It might look difficult, however it is very simple to solve once you make sense of the clues. The multiple ...
- 197
12
votes
2
answers
1k
views
Dissect the almost 10x10 square into 4 congruent pieces.
Your task, should you accept it, is to dissect the following shape into 4 congruent pieces.
Rotations and reflections are allowed. You must cut along the grey lines.
You don't need mathematics to ...
- 32.7k
5
votes
1
answer
689
views
Fastest checkmate by castling
Given that the two chess players cooperate, what is the fastest checkmate with the castle (either White's or Black's) as a final move?
- 6,726
3
votes
1
answer
116
views
Raven's matrix: circles with loops inside or outside
Link: https://sep.stanford.edu/sep/jon/raven/
This is the last question on a Raven's Matrices style IQ puzzle. Question 60 of 60. What is the answer to this puzzle? My guess would be option 2... ...
- 197
6
votes
2
answers
430
views
Making sense of a logic puzzle in Blue Prince parlor room
Context: The game Blue Prince regularly gives the player a specific type of logic puzzle. The setup is that there is a blue box, white box, and a black box. Each box has one or more statements written ...
- 33.3k
17
votes
8
answers
1k
views
Both, One, Neither
There are 99 people in a building. All the people are either Agents or Jokers. You know that at least 50 are Agents (they might all be Agents).
You can point to any two people, and ask to any third ...
- 1,974
10
votes
2
answers
823
views
Can you dissect a 5x9 rectangle into nine (or ten) rectangles and/or squares?
Warmup Question:
Can you dissect a 5x9 rectangle into nine rectangles and/or squares such that all rectangles and/or squares have integer side lengths and none of them have the same dimensions? For ...
- 27.6k
2
votes
2
answers
147
views
A riddle for your time (8)
I mark your thoughts but leave no trace,
I’m silent, swift, and keep your pace.
I vanish fast when you forget,
Yet shape the future’s alphabet.
What am I?
- 986
3
votes
4
answers
199
views
A riddle for your time (7)
Born in a box, I’m killed by light,
I only live when day turns night.
I dance on walls without a sound,
But when it’s bright, I’m not around.
What am I?
- 986