This puzzle is an extension of this one: Minimize the longest King chain on a 5x5 binary board Given a grid filled with numbers, we define a King chain to be a path on the grid such that: The path can be traversed with chess King's moves (moving to one of 8 adjacent cells at a time), The numbers...

This puzzle is an extension of this one: Minimize the longest King chain on a 5x5 binary board Given a grid filled with numbers, we define a King chain to be a path on the grid such that: The path can be traversed with chess King's moves (moving to one of 8 adjacent cells at a time), The numbers...

Two knights are placed on opposite corners of a 4x4 grid. Can you move* each knight 7 times, such that each cell of the grid is visited exactly once by exactly one of the knights? *Note that a knight moves 1 cell in one direction (horizontal or vertical) and two cells in an orthogonal direction.

The puzzle is as follows: How many straight lines do you need to draw the least possible to join all the smiling toasters if you should not raise the pen or go over any line already drawn? Remember that it is allowed to cross. The alternatives given are as follows: 6 5 7 4 How exactly should...

The puzzle is as follows: The figure from below represents a set of 12 squares joined forming a closed loop. By using only the numbers from 1 to 12 fill in the blanks. The condition is that, without repeating any number. It must be fulfilled that the sum of the four values written along each sid...

The puzzle is as follows: By only using matchsticks of equal length it has been built a set of equilateral triangles as indicated in the figure from below. Relying in that information, What is the minimum number of matchsticks that must be removed so that there isn't any of those triangles? Th...

I have the following hex-string puzzle: 734f5b32724d5d35200e7b293219292a20093579274a3462744b27722b0822672b4b396767081c7633190b222c15163d361803692314036a3105153e36094739350f54262f0241722b08476e78125a6f2b104477781c58237f174f773e474f676d4549332b1c0b772812594008250a14282316047b210a506d2f194d726c1f562...