Unanswered Questions
86 questions with no upvoted or accepted answers
27
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Is there a move-efficient way to rotate the center pieces on the Octo-Star?
I'm looking for a more efficient algorithm to rotate the center column of the Octo-Star puzzle 45 degrees.
The situation below occurs when four properly-oriented edges are next to each other, ...
- 53
22
votes
0
answers
2k
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REALLY important days in history
@Z. Dailey asks a mathematical puzzle Important days in history... and to come! with a series of dates in years 1973, 1978, 1983, 1992, 2005.
My puzzle asks the question: What is the previous date in ...
- 197
9
votes
0
answers
370
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My drunken formula?
I know that today is an important day, but I can't remember why... All I have in my possession is this formula I wrote last night in my drunken stupor:
You go here:
$$B = 25 + \biggl(\frac{O}{...
- 10.6k
9
votes
1
answer
2k
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Is there another name for this puzzle? (Kyudoku, Nine Find)
Is there another name for this type of puzzle? I can only find two examples of it online:
https://www.brainzilla.com/logic/kyudoku/
http://ninefind.com/
In the game you start with a 6x6 grid filled ...
CommunityBot
- 1
8
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0
answers
162
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8
votes
0
answers
495
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xkcd 2957 - A Crossword Puzzle
The latest xkcd is a crossword puzzle. I thought it might be of interest to this community.
Solve it on Penpa+
Clues:
Across
1 Famous Pvt. Wilhelm quote (10)
11 IPv6 address record (4)
15 β...
- 19.3k
8
votes
0
answers
559
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Ode to a Nightingale: a puzzling study in literary criticism
The field of literary criticism is an interesting and fruitful one, in which puzzlers might carve out a niche. This was recently brought home by a conversation I had with a sagacious old gentleman in ...
- 5,430
8
votes
0
answers
346
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We found text from the year 2040!
Recently, the first surviving examples of text from the βββββββββββββββe discovered! The unearthed artifacts included a collection of rectangular tablets inscribed in the hitherto unknowβββββββββββββββ...
- 181
8
votes
0
answers
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Is it possible to create a knot that is locked only when the rope is stretched?
Is it possible to create a knot that is stable/locked when the rope is stretched?
When the tension is relived the knot should open.
- 8,333
7
votes
0
answers
168
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Logic and geometry problem 2
My question is whether or not a deadlock can occur in Crisscross. A deadlock is defined as a position, an arrangement of checkers, in which the board has been filled but neither player has won.
...
- 6,959
7
votes
0
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899
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They are all K-verbs
Find the missing verb.
G: Fold, Break, Pry
D: Reduce, Vibrate, Rob
B: Soak, Subtract, Thrash
J: Sleep, Squeeze, ?
Subtle Hint:
Moderate Hint:
Decisive Hint:
Very Decisive Hint:
- 5,257
7
votes
0
answers
368
views
Do you see the point?
Original puzzle by me.
Remember to always obey your superiors. The first one should be 08594.
Hint:
- 821
7
votes
0
answers
346
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Stress Not! - A North Daniels' Puzzle
Beep, beep, beep, beep...
No, this was not the sound of D.S.I North Daniels playing miniature cricket on his phone, although that would be a preferable situation to the one he is in now.
Unfortunately,...
- 705
6
votes
0
answers
306
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What song are these lyrics from (translated into emojis) ~ 2
πππ€ ππ°
ππ°πΊοΈποΈποΈ / ππ°π―β
π°οΈππ«±π«²πππππ
ππ§ π€ πποΈπ°ππ
ποΈπ°ππ (2x)
I am happy to share this wonderful song with you. You will love driving or doing any travel with this song.
The ...
- 3
6
votes
0
answers
224
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Light the darkness
The answer is an event in Wikipedia. Find the date.
4οΈπ
π€β¬οΈπͺοΏ½οΏ½(π₯π΅π-S)(π²21+A)πΊπΈ
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