The crux of this problem, as given in Hint 2, is a Vigenère cipher. To apply a Vigenère cipher, we need three things: the alphabet, the ciphertext, and the key.
The easiest to figure out is the alphabet. The note tells us that
The base range isn't the standard, but it's still standard.
We also ...
I found some sample Mensa IQ test questions at the Mensa Singapore website(https://www.mensa.org.sg/answers/). There were 8 questions inside it. I managed to answer most of them without too much problem, however, I could not answer the last one. This is the question:
I could not figure out the p...
Here's a map, which I found here:
Your challenge is to four-color this map while minimizing your use of the fourth color.
More specifically, color the map with four colors so each region is a different color from all of its neighboring regions. Your score is the number of regions colored in your...
Who am I?
(All answers that satisfy this riddle are valid)
A wall in a gallery hangs some paintings that looks like portion of film's poster. And looking closer at the paintings some figures of characters are visible like colored squares. Can you guess the titles of film posters and name the characters inserted on them?
Normal Sudoku rules apply. Numbers on thermometers must increase, starting from the bulb end. Killer clues indicate the sum of three digits in a cage, which cannot include repeated digits. In columns 4,5,6 no two orthogonally adjacent cells contain consecutive digits.
NOTE: As you might have gues...
An entry in Fortnightly Topic Challenge #42: Wordless Connecting Walls
The 16 images below may be partitioned into 4 groups of 4 connected images.
The overall connection between the groups this time is a little different.
For each group, I want you to choose a fifth member - some of the groups h...
You see combinations of geometric objects from a circle, a triangle, a square, a rectangle and a diamond and corresponding them numbers $4, 6, 19, 190, 1900$.
Question Can you define the number for the bottom row?
This is more difficult instance of a puzzle posted here.
Rules similar to Sudoku applies:
In each disk, the numbers 1,2,...7 should appear exactly once.
No line may contain duplicate digits (note that there are lines in 3 directions).
Solution is unique, and can be found by using classical su...
In a competition we need to find the last name of a scientific which is hidden in this PDF: https://fciencias.ugr.es/images/stories/documentos/sanAlberto/basesElEnigma2020.pdf
Any idea?
I know it has 8 letters
