A Roundabouts puzzle consists of a square or rectangular array of squares in which some of the
squares contain a circular roundabout. The puzzle is solved by drawing a path which passes through the center
of every square without crossing over itself until it returns to the square in which it started. The path
must change direction at every roundabout, and it must also change direction exactly once in the intervening
squares between roundabouts. There is a single unique solution which can be found without recourse to guessing.
These graphics show a Roundabouts puzzle in the Crossword Express
and a PNG graphic file produced by the program's print function, showing the complete puzzle solution.
See also a full size version of a PDF file
showing the solution.
The key features of the Crossword Express Roundabouts puzzle function are as follows:-
Fully automatic construction of puzzles. Puzzle sizes can range from a minimum of 6x6 up to a maximum of 14x14.
A multi-build function allows the construction of many puzzles (thousands if necessary) in a single operation.
Manual construction of puzzles is possible. This may be handy if you have a puzzle derived from a printed publication, and you want to turn it into a
Crossword Express puzzle.
Puzzles can be printed in an unprecedented range of user controlled colors and formats.
Output can be sent direct to the printer or, if you install the appropriate software, it can be sent to a PDF file. The
recommended software for this purpose is Primo PDF which
you can download free from their website, although you might consider sending them a small donation if
you find their program useful. Mac users will be able to create a PDF file directly from the screen provided by
the printer driver.
Formatted output can also be exported from the Print screen to graphic files which conform to the BMP, GIF, JPG or PNG formats.
A fully interactive Solve function is available to allow you to solve the puzzles "on screen" without needing to print them.