Rubik’s Cube https://www.mathematische-basteleien.de/rubikscube.htm
Probably you will have to repeat this sequence.
Probably you will have to repeat this sequence.
You have more pieces than with pentiamonds and therefore more ways of playing.
All points must have the same distances from each other in „reality“.
You have to fit them together, so that you have a „knot“.
The reason is that you often have to go back to the last branch.
You have 9+9+90+90+900+900 = 1998 palindromes up to one million.
Jacob’s ladder can have different meanings in German (maybe in English, too).
– A closed line only results if m and n have no common divisor.
You must arrange the squares, so that they must have in common at least one side.
Sometimes you don’t have a 2×2 square for moving a piece (1).