This is Perl module Layton::SlidePuzzleSolver. INSTALLATION Layton::SlidePuzzleSolver installation is straightforward. If your CPAN shell is set up, you should just be able to do % cpan Layton::SlidePuzzleSolver Download it, unpack it, then build it as per the usual: % perl Makefile.PL % make && make test Then install it: % make install DOCUMENTATION Layton::SlidePuzzleSolver documentation is available as in POD. So you can do: % perldoc Layton::SlidePuzzleSolver to read the documentation online with your favorite pager. Masahiro Honma