Here are selected excerpts from Hirofumi Fujiwara's web site. I found these sliding block puzzles elegant and challenging. My contribution was to add a Solver option to the applet. -- Vincent.
Souce program with solver, after Fujiwara's V3.01 source available on his site.
Note that Fujiwara has a copyright on the applet. Please consult the original pages on proper use of the applet.
Sliding Piece Puzzles
by Hirofumi Fujiwara (Japan)
Original of this page(English)
Sliding Piece Puzzle is very familar, the rule is very simple but it requires deep thought.
I made a JAVA version of Sliding Piece Puzzle, and I made my Java applet. My Java Puzzle Page has been well known in Japan. I dicided to make English page so that the people all over the world can enjoy my java puzzle pages.