I don’t know about other countries but here in the UK Train Tracks is a popular puzzle that appears in many newspapers.
This sketch provides an endless supply of randomly generated 6x6 Train Track puzzles that are guaranteed to be solvable. I plan to use this as the basis for a larger Train Tracks project for my website which will include
variable grid sizes from 6x6 to 15x15
user select minimum % of squares that have tracks
unlimited undo
way-points (definable undo positions)
proper GUI
user supplied puzzles
In the meantime I hope you enjoy solving the puzzles
The OpenProcessing version of Train Tracks (embedded in first post) was work in progress and had a number of issues which needed to be resolved.
So I have finally finished the final version of Train Tracks which you can play here. The puzzle starts with a 6x6 grid but you can edit the settings to get more challenging puzzles. Enjoy