OmniSlide
- http://www.sapello.com/slidepuzzle/
- 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.
Quazzle
- http://www.quazzle.com/
- 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.