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17 votes
1 answer
328 views

PSE Advent Series 2025 (Day 11): Number 11 (not even)

2 votes
0 answers
17 views

PSE Advent Calendar 2025 (Day 12): Hiding in plain sight

0 votes
2 answers
501 views

Will we be able to solve the Proca retractor?

3 votes
2 answers
339 views

A Pirate and Three Generalized Piles of Treasure

12 votes
1 answer
1k views
+50

PSE Advent Calendar 2024 (Day 19): A Christmas puzzle in (1)225 characters

19 votes
2 answers
795 views
+50

PSE Advent Calendar 2021 (Day 18): A Reunion, and Christmas Decorations

18 votes
1 answer
465 views

PSE Advent Calendar 2025 (Day 10): PSE Advent Calendar 2025 (Day 10)

24 votes
2 answers
1k views

PSE Advent Calendar 2025 (Day 4): Ring Bethlehem, the day begun!

1 vote
4 answers
382 views

Prove/disprove that polygons on a sheet of paper having a common edge, can always be colored with one of two different colors.

5 votes
2 answers
693 views

A Strangely Warped Riddle

2 votes
1 answer
433 views

What Am I? Alive Without Breath

13 votes
2 answers
575 views

Fixed and Unchangeable

11 votes
1 answer
460 views

What is a Commutative Word™?

9 votes
0 answers
170 views

Missing Key Caps

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