Penrose's Train Challenge
Penrose's Train Challenge
For a description of railroad mazes, see the Demonstration "Penrose's Railway Mazes". The train must go from the start (S) to the finish (F). The train can move only in the forward direction, following the curvature of the track. No sharp turns are allowed.
While "Penrose's Railway Mazes" gives you the solutions, it is not interactive; the present Demonstration helps you to find the solution by hand with mouse clicks.
No paper and pencil are necessary: here you can solve the puzzle yourself by clicking the green dots in the right sequence, while the system checks that your train does not make any sharp bends.