Rubik’s Cube https://www.mathematische-basteleien.de/rubikscube.htm
Probably you will have to repeat this sequence.
Dein Suchergebnis zum Thema: have
Burr Puzzle https://www.mathematische-basteleien.de/devilsknot.htm
You have to fit them together, so that you have a "knot".
Snake Cube https://www.mathematische-basteleien.de/snakecube.htm
The reason is that you often have to go back to the last branch.
Numeric Palindromes https://www.mathematische-basteleien.de/palindromes.html
You have 9+9+90+90+900+900 = 1998 palindromes up to one million.
Jacob’s Ladder Toy https://www.mathematische-basteleien.de/jacob.htm
Jacob’s ladder can have different meanings in German (maybe in English, too).
Pentominos https://www.mathematische-basteleien.de/pentominos.htm
You must arrange the squares, so that they must have in common at least one side.
Magic Square https://www.mathematische-basteleien.de/magsquare.htm
If you take the numbers 1 to 9, you have the standard square. ………….8+c
15puzzle https://www.mathematische-basteleien.de/15puzzle.htm
Sometimes you don’t have a 2×2 square for moving a piece (1).
Taxicab Geometry https://www.mathematische-basteleien.de/taxicabgeometry.htm
Formula: AP+PB= |x2-x1| + |y2-y1| The points have only integer coordinates in the
Oscillation by Friction https://www.mathematische-basteleien.de/oscillation.htm
Hence you have an harmonic motion.