Let's say you fill in a 5 by 5 square with the numbers 1, 2, ..., 25. Is there a way to fill it so that the product of the first row is equal to the product of the first column, the product of the second row is equal to the product of the second column, ..., etc?

An entry in Fortnightly Topic Challenge #50: Escape Rooms I hesitated to enter this in the Escape Room FTC, but I definitely was inspired by the challenge to create this puzzle, and it is, in some sense, an escape room. This puzzle is definitely a Sudoku, with the following indicators: Arrows -...

What is the fastest, in terms of moves, for a legal game to come to a checkmate, either black or white with a Knight and such that both all other cases of the checkmated King are attacked by an opponent Knight and the King isn't in the edge of the checkerboard?

The puzzle is as follows: Mike has a thin sheet of cardboard which is 96 centimeters large by 24 centimeters wide and a guillotin whose maximum cut length is 80 cm. Assuming this guillotin can cut a maximum of two layers of such cardboard. What is the minimum cuts he can make in order to get fro...

The puzzle is as follows: Suppose that you have a metal structure made by brass wire. Assuming that you must get 44 rods of the same size each. What is the least cuts to be made using an electric grinder asuming that you cannot bend the structure? The choices given are: 5 6 4 7 This peculiar...

This question is continuation of this one. You might want to read that if you haven't already. 'That's it' I thought. 'B3TA_Z3R0' should be the thief's code-name. Typing that in the 4th monitor's input, took me seconds. But what came after was surprising. A message. Apparently being typed while I...

The puzzle is as follows: The figure from below represents a peculiar structure which consists in congruent triangles and is made of an iron wire. How many cuts passing through all the dots showcased can be made at minimum to get the whole structure unassembled? The choices given are: 4 3 5 6...

I remember seeing an answer for this and I want to see if anyone else can find that answer. After a few days if nobody has an answer, I will post a hint to go with the quetion.

Nine months ago I started my journey on Puzzling on a rough way with this question. I honesty hope this time I won't generate so extended discussion...!I love self-referential questions, puzzles or tests. And I still think those make the most efficient way to evaluate the intelligence of a person...

Here is the puzzle: Alice and Bob leave in a world where all diamonds are divided into 2 types: Light and Heavy. All diamonds look exactly the same. All light diamonds weight exactly 100g, all heavy - exactly 101g. Now, Bob wants to sell Alice N light and N heavy diamonds. Before he does it he h...