Print-It-Yourself puzzle are puzzles that you can download from http://oskarvandeventer.nl/Print-It-Yourself/ and print on your own 3D printer. Please print for personal use only.
Curated by: OskarPuzzle (324 videos)
Print it yourself at https://oskarvandeventer.nl/Print-It-Yourself/. Buy at Rainbow Runner is a timing puzzle, perhaps the first of its kind. It has six track of six colors and six lengths. The object of the puzzle is to start six marbles with such timing that they all arrive at the same time. If one marble arrives early, it will flip the switch at the end, and prevent the other marbles from finishing. The puzzle is already fairly challenging with two marbles. I solved it once for three marbles. Six marbles is likely humanly undoable. Copyright (c) 2026, M. Oskar van Deventer. Frequently Asked Question: http://oskarvandeventer.nl/FAQ.html Buy Oskar puzzles at https://www.puzzlemaster.ca/browse/inventors/oskar/ (USA, CA) and https://puzzleguy.store/collections/oskar-van-deventer (EU).