Roach City Software has developed two unique puzzle games, Slider and Slider2. You can download Slider2 from this site. (See the Downloads page.)
Slider2 is an entrant in the 2007 Independent Games Festival. The current version is the final version (more recent, and more complete, than the IGF version).
Slider was initially published as shareware in the early 1990's. While it ran under Windows XP, it does not run under more recent versions of Windows.