Nick Baxter's Sliding Block Puzzles
- Offers photos and a Java applet to play rare and collectable sliding block puzzle designs online.
- http://www.puzzleworld.org/SlidingBlockPuzzles/

Quazzle
- Online mixup puzzle game in which the object is to slide the pieces of each image to form a complete picture in the least amount of moves. Also offers a free downloadable screensaver.
- http://www.quazzle.com/

OmniSlide
- Online slide puzzle which has no empty space. Instead, the pieces wrap around when the entire row or column is moved. Also available for download and placement on web pages.
- http://www.sapello.com/slidepuzzle/

kibuR's Fifteen
- Double sided sliding puzzle. You cannot slide individual squares. Instead, you move squares by sliding rows and columns of squares at the same time.
- http://www.dotsphinx.com/games/rubik/fifteen/

Boxcar Blockade
- A sliding box puzzle game with hundreds of challenging computer-generated levels.
- http://www.rhymezone.com/games/bb/

Mosaic Faces
- Celebrity online sliding puzzles offered at four difficulty levels.
- http://www.julienne.com/mosaichome.html

Absolute Lines
- Challenging online puzzle game on a checkerboard.
- http://gameknot.com/lines.html

9 Piece Puzzle
- Put together the Boston University logo (Java).
- http://scv.bu.edu/~aarondf/java/puzzle9.html

Dance Puzzle
- Line drawings make these puzzles quite fiendish. You can reach the Hall of Fame if you're good enough.
- http://www.tdbs.is.nl/scripts/interactief/game/puzzel/index_EN.asp

Sliding Piece Puzzles
- Different sizes of pieces make these puzzles much more difficult than regular sliding puzzles.
- http://www.pro.or.jp/~fuji/java/puzzle/slide/index-eng.html

Cube Slide
- Hexagonal variation on sliding tile puzzles. There must be two adjacent open spots to move a hexagon.
- http://www.24hours7days.com/Hexagons/index.html