Newest Questions
29,036 questions
3
votes
1
answer
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Square dissection into 4 congruent polygons with same perimeter length of square itself
How can you dissect a square into four non-self-intersecting congruent polygons such that each polygon has the same perimeter length as the given square?
The goal is to have minimal number of edges ...
- 1,344
8
votes
1
answer
280
views
Maze Run Puzzle 2.0
So, we gave it another go after reviewing and editing the original post. For context, here's the post: Maze Run Puzzle
SUMMARY:
In the last post I mentioned that me and a friend created the maze run ...
- 197
6
votes
2
answers
146
views
Is it possible to put a cooperative checkmate here in three moves?
The puzzle is presented in two versions: full (1) and abbreviated (2).
Is it possible to put a cooperative checkmate here in three moves? (white makes the first move)
h#2,5 (AP) Stepan Nichto. ...
- 304
25
votes
1
answer
691
views
A pair of Find-the-stars puzzles
Find-the-stars instructions:
A Find-the-stars puzzle is played on a square grid that is initially empty except some squares contain arrows.
The goal of the puzzle is to fill some empty squares with ...
- 27.6k
11
votes
2
answers
751
views
Filling a 6x6 square with tetronimoes
Consider a square grid of 6 by 6 cells. Can you fill it with 9 tetronimoes (Tetris pieces)? Sure you can! In fact, there are many, many solutions to that. Here is one:
If there are n unique solutions ...
- 1,567
4
votes
1
answer
340
views
2014 MIT Aquarium Hunt Puzzle #8
Here is the content of the puzzle (or see https://puzzles.mit.edu/aquarium/2014/8.pdf):
Title: MAKE A WISH FOUNDATION
Flavor: Dear Travel Log, This island is inhabited by solemn beings who look like ...
- 141
8
votes
1
answer
682
views
Shortest closed path for pilgrims on planet Cube
The planet Cube is an ordinary cube with 6 faces, pilgrims must visit 6 towns, one on each face. The length of any edge of Cube is 3 miles, the cities have the following coordinates (x,y,z) in miles:
...
- 1,344
0
votes
3
answers
510
views
Maze Run Puzzle
So, a friend and I created this maze puzzle. Have a go.
The rules are as follows:
Doors open in the direction that they point
Once you move through a door, you cannot go back through it
Empty spaces ...
- 197
-5
votes
0
answers
141
views
Estimating a sum of consecutive prime numbers [closed]
$p_n = 0.069n^2 + 2.229n - 1.85 \ $ can be used to estimate the nth prime number for $ \ 1 \le n \le 25.$
Using some combination of arithmetic, algebra, calculus, by hand, and a calculator, please
...
- 2,482
-8
votes
0
answers
99
views
Find the Missing Number in This Intriguing Pattern [closed]
Examine the sequence below:
1, 3, 6, 10, 15, 21, ?
Identify the number that should replace the question mark.
- 1
3
votes
0
answers
151
views
Murder mystery puzzle told through seven news articles [closed]
Project52hz is a puzzle series with different types of challenges, all leading up to something bigger. It’s been tough so far, and only one person on Reddit seems to have made real progress.
The first ...
- 31
0
votes
1
answer
214
views
Can you determine the tasty item?
2111121221
It’s a nice way to end a meal! (7)
This puzzle has nothing to do with phone numbers.
- 27.6k
11
votes
1
answer
928
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 ...
- 1,344
8
votes
0
answers
501
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
592
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