Newest Questions
29,037 questions
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Beating Harvard scientists
Long ago, Ivan Panin found 30 ways in which `7' is encoded in Genesis 1:1. He challenged Harvard scientists to create an English sentence with just as many multiples of 7. With all their wisdom and ...
- 101
5
votes
1
answer
117
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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 ...
- 1,364
8
votes
1
answer
306
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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
152
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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
706
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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
765
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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
345
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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
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683
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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:
...
- 1,364
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3
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515
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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
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142
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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
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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.
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152
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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
1
vote
1
answer
216
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 ...
- 1,364
8
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509
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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