Unanswered Questions
99 questions with no upvoted or accepted answers
20
votes
0
answers
1k
views
Alternate, complex potions puzzle from HP fanfic
A long narrow room. The entrance is blocked by purple flame, the path onward blocked by black flame. On a table, the only thing in the room, are two dozen potions in opaque bottles. Half green glass, ...
- 201
17
votes
0
answers
319
views
Edge Removal Game
There is a complete undirected graph with n nodes (n > 1). Alice and Bob take turns removing one edge from the graph, with Alice going first. The player whose move causes any node to become ...
- 2,572
15
votes
0
answers
2k
views
14
votes
0
answers
915
views
Grandma's keynote
Found this note which is addressed
To my grandma, in her chest
Since she's passed now, here's my quest..
What tickled her interest?
And who invited her as guest?
- 123
13
votes
0
answers
393
views
The Snake and the Hunter
The Snake and the Hunter is a game for two players who play in two rounds interchanging the roles of snake and hunter. The game is played in a rectangular grid of points, say 6×6. In both rounds the ...
- 19.7k
11
votes
0
answers
557
views
I'm a number with a special product, so name me when you think you've got it
In the blocks that come before,
their special product tells us more.
To guess my scheme you'll need calculation,
but only little tests of recreation.
Each block contains atoms strong as Thor,
...
- 2,306
9
votes
0
answers
682
views
A nice riley, hopefully is fun
Within these lines is a puzzle I've made.
With cunning and wit, can you guess my trade?
Inside the tome of the element's power,
One minute per side, you'll read for an hour.
A single number of the ...
- 20.1k
9
votes
0
answers
380
views
A Glutton and a Split Check
N, T, A, B are arbitrary constants in this problem. I have only definitively solved the N=1 subproblem, so, if the general problem cannot be solved, I will be satisfied to mark as accepted a solution ...
- 2,381
9
votes
0
answers
379
views
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}{C}...
- 10.6k
8
votes
1
answer
564
views
An endless succession of harmless checks
Similarly to my previous chess instalment, this puzzle continues to explore the underlying geometry to be found in a sequence of consecutive checks. This time however, we will ditch the limiting ...
CommunityBot
- 1
8
votes
0
answers
513
views
Secret message from a kitten (definitely not a cosmic horror from beyond time)
Can you decrypt this secret message?
Transcript:
...
- 10.9k
8
votes
0
answers
335
views
Where are you according to this riddle?
Go forward, and you'll arrive back. Go back, and you'll arrive back. Go west and you'll come from the east. Go east and you'll come from the west. Jump once and you black out, jump twice and you're ...
- 494
8
votes
0
answers
302
views
Doubling the cube with rational Meccano strips
In three monographs published in 2006, 2008 and 2014 Gerard 't Hooft considered "Meccano mathematics": how to construct specified distances and regular polygons by a rigid system of ideal ...
- 10.2k
8
votes
0
answers
346
views
Even and primes puzzle?
These are secret numbers that increase regularly. What are the next two numbers?
If you like numbers, it will be fun.
$2^3 \times224299$
$2^2 \times 3^2 \times 19 \times 3557$
$2 \times 5 \times ...
- 6,631
8
votes
0
answers
216
views
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.
- 8,381