This zrf is a collection of 5 traditional sliding puzzles:
 
Airman Puzzle
This puzzle remembers to the flight of Lindberg in 1927 over the Atlantic Ocean. The red 2 x 2 block is a air machine, which is to navigate from the upper left corner (New York) over the ocean to the lower right corner (Paris).
This puzzle was created in the 1920ies years in the USA.
 
Dad's Puzzle
This puzzle is said to express the problems of the head of the family in arranging the pieces of furniture. The 2 x 2 block is a grand piano which is to put from the upper left to the lower left corner. It is a nice exercise to bring the grand piano at first to the lower right corner.
Probably is Dad's puzzle a product of the 19th century.
 
L' Ane rouge (The red dunkey)
The aim is to bring the red dunkey (the 2 x 2 block) into the middle of the lower side. The shortest solution has 81 moves.
This puzzle is probably known in France since the 19th century. Frequently there was a picture of a dunkey on the red piece. D. Fremelin has shown with a computer that you can reach 65880 positions from the starting position of the red dunkey puzzle.
 
Century Puzzle
Slide the red square to the lower middle.
The Century Puzzle was created by J. H. Conway from Cambridge. He was interested to find the most difficult puzzle on a 4 x 5 board. D. Fremelin has shown with a computer that you can reach 109260 positions from the starting position of the Century Puzzle.
 
Washington Puzzle
The red square symbolizes the first american president Washington. He goes to all corners as symbol of key stones of his career. The objective of the puzzle is to slide the red square to the four corners.