There's a parity problem that might happen when solving the 4x4 cube when 2 corners should be swapped. In all the videos I saw when ceasing the parity problem they are doing such an algorithm which also changes some edges, but I'd like to know which is not changing anything else, just the 2 corne...

On a remote Greek island there was a small community, populated completely by twenty-four grandmothers—indeed it was named after the first two grammas (as they called one another) to join. Each gramma had her own collection of characteristics. Five of the grammas were always concerned with when ...

Warmup question: Dissect the shape shown below into 4 congruent pieces each containing 2 circles and 1 square. Clarifications: The 4 pieces can be rotated and/or reflected versions of each other. The 4 pieces don’t necessarily have to each contain the same amount of black border from the origina...

Here is a puzzle sold in the late 80s and 90s in shops and market stalls. Now in this digital age, it can easily be shared. Hope you like it! There was a version with more patterns, with symmetry, each of the 4 colours in L shapes, T shapes or horizontal lines so about 10 different puzzles to t...

This is a Futoshiki puzzle. You must put a single digit (1 through 7) in each empty square so that each row and each column has exactly one of each digit, and the inequality signs between adjacent squares are true. The following puzzle is taken directly from Simon Tatham's collection (where he...

I was presented with this topographic puzzle, that I do not know how to solve. I think the answer is a word 0VScDaCY.png