Macadam Bumper is a PC game, a very early pinball simulation with the nice option to create your own pinball tables.
Released in 1987 it was designed by Remi Herbulot, the maker of the wonderful game Dune.
In one floppy it give to the player the possibility of build theirs own pinball table, with bumpers, ramps, and all the stuff.
There was also a bug that make possible to redesign every component. (Simply click on the border between the colors bar and the pinball table to activate the black color, that crunch the inner glue of the matter)
The game is free to download since it has been discontinued by his publisher and need a slow-down utility to run on modern computers.