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