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Top Questions

3 votes
1 answer
15 views

Dissect a square grid into four congruent polyominos of same perimeter as the square

0 votes
0 answers
34 views

Beating Harvard scientists

5 votes
1 answer
125 views

Square dissection into 4 congruent polygons with same perimeter length of square itself

8 votes
1 answer
318 views

Maze Run Puzzle 2.0

25 votes
1 answer
718 views

A pair of Find-the-stars puzzles

7 votes
2 answers
154 views

Is it possible to put a cooperative checkmate here in three moves?

11 votes
2 answers
773 views

Filling a 6x6 square with tetronimoes

4 votes
1 answer
346 views

2014 MIT Aquarium Hunt Puzzle #8

8 votes
1 answer
686 views

Shortest closed path for pilgrims on planet Cube

0 votes
3 answers
519 views

Maze Run Puzzle

17 votes
8 answers
1k views

Both, One, Neither

11 votes
2 answers
596 views

Make him shuffle most!

8 votes
4 answers
368 views

Both, One, Neither… But With A Twist

8 votes
0 answers
517 views

Two popular bright rivals

11 votes
1 answer
929 views

longest path in 10x10 grid

12 votes
2 answers
1k views

Dissect the almost 10x10 square into 4 congruent pieces.

29 votes
2 answers
1k views

A puzzling site... But what am I looking for?

10 votes
2 answers
823 views

Can you dissect a 5x9 rectangle into nine (or ten) rectangles and/or squares?

1 vote
1 answer
217 views

Can you determine the tasty item?

6 votes
2 answers
428 views

Making sense of a logic puzzle in Blue Prince parlor room

3 votes
0 answers
152 views

Murder mystery puzzle told through seven news articles [closed]

5 votes
1 answer
689 views

Fastest checkmate by castling

20 votes
7 answers
2k views

Dissect the figure into two congruent parts.

28 votes
2 answers
2k views

Smallest possible pentomino farm

3 votes
1 answer
237 views

Breakfast, socks, and diseases

21 votes
2 answers
1k views

Tetris Perfect Clear puzzles

3 votes
4 answers
199 views

A riddle for your time (7)

10 votes
1 answer
487 views
+50

Satisfying class choice preferences

24 votes
4 answers
2k views

Dividing a hexagon into 9 equal regions

8 votes
3 answers
637 views

Can you swap the positions of the 8 Chess bishops?

1 vote
1 answer
119 views

Some concentric circles

13 votes
2 answers
361 views

The Flow of Time

0 votes
0 answers
271 views

pilgrimage speed reference [closed]

14 votes
1 answer
575 views

"Incomplete rectangles"

3 votes
1 answer
113 views

Raven's matrix: circles with loops inside or outside

12 votes
5 answers
971 views

Fill the circles so that the sum of the three numbers along each of the ten lines is the same.

3 votes
1 answer
382 views

How many chess pieces does it take to "cover" all spaces on a chessboard if you must have at least one of each type?

2 votes
2 answers
147 views

A riddle for your time (8)

16 votes
1 answer
2k views

There are no employees at the store. Why not?

20 votes
1 answer
1k views

I'm looking for...ah, found it!

19 votes
1 answer
1k views

Riddle in Cheshire Crossing comic

19 votes
3 answers
1k views

Can you get all the coins no matter where they are placed?

9 votes
1 answer
385 views

Reindeer cryptic crossword

8 votes
1 answer
703 views

Awake and asleep

28 votes
1 answer
1k views

The CXV sequence

3 votes
1 answer
223 views

What is a Good Word™?

14 votes
1 answer
790 views

A clockwise arrangement


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