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17 votes
6 answers
1k views
+150

Dissect the figure into two congruent parts.

6 votes
2 answers
362 views

Dividing a hexagon into 4 identical regions

13 votes
1 answer
560 views

A clockwise arrangement

6 votes
1 answer
154 views

Ducks and Penguins

5 votes
3 answers
431 views

Make a Venn diagram with five triangles

4 votes
1 answer
121 views

Magic World Making

31 votes
3 answers
6k views

Can you solve my Chess Sudoku puzzles?

9 votes
5 answers
668 views

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

28 votes
1 answer
952 views

The CXV sequence

6 votes
4 answers
1k views

3D Packing Puzzle: Can 17 Mixed-Size Blocks Fill a Cube?

1 vote
2 answers
385 views

Prefixes of French words in the Princeton linguistics challenge

9 votes
2 answers
273 views

Replace the variables with something.

7 votes
1 answer
307 views

Build two squares by joining tetrominoes

2 votes
0 answers
157 views

Seconds in the balance

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