At last I finally cornered the Atom Riddles! But there's one more before Christmas! This time's gonna be different!
It's still going to be that the answer is an atomic element. The puzzle is a acrostic, but the first letters aren't revealed, you have to find them! That's where the lateral thinkin...
I am a five letter word.
If lost, I can help.
SCRAMBLED, you can put something in me.
Part of me divides people.
Part of me is contained in many games.
BACKWARDS, part of me appeals to many people and another part is used by many people.
What am I?
It is known that P pentominoes cannot tile a 5x5 square board.
Q1: If the east and west edges of the 5x5 square board are "wrapping around" (if you move a piece through one of the edges, the part appears on the opposite edge), can you tile it with P pentominoes?
Q2: In addition to the above, the ...
There are some users who sign up for puzzling but they just ask a question (most probably from ongoing contest, or for spams, or unrelated questions to puzzling etc) and leave the page. Therefore I believe to ask a question in Puzzling, there has to be some limitations such as;
At least 100+ rep...
There are n red points and n blue points in the plane. Show that you can always join all the red and blue points with straight lines so that no two lines cross. Each point can have exactly one line joining to or from it. No three points are colinear.
This is a Sashigane puzzle, where you divide the grid into L shapes.
Rules taken from Nikoli:
Divide the grid into L shaped blocks - one block wide. All blocks must be L shaped.
Cells with open circles form the knee (bend) in a block.
The number in an open circle shows the number of cells in its...
A function of one variable $y = f(x)$. However, I suspect that the function does not need to necessarily be strictly mathematical.
If $x = 1$, then $y = 0$.
If $x = 2$, then $y = 0$.
If $x = 10$, then $y = 9$.
If $x = 3$, then $y = 3$.
If $x = 20$, then $y = 18$.
If $x = 1990$, then $y = 1989$.
W...
An entry in Fortnightly Topic Challenge #45: Flags
You are provided with a 9x9 grid of squares and 21 minimalistic flags (pictured below, all shown to scale).
TASK: Assign a colour (Black, Blue, Green, Orange, Red, White, or Yellow) to each of the 81 numbered cells so that the grid can be exac...
Here is a five letter word: #####
It's romantic to have a #####.
It's depressing to be #####ed.
A nutcracker's job's to #####.
