Some fun software ;) On magictile; http://www.gravitation3d.com/magictile/ "This program aims to support twisty puzzles based on regular polygonal tilings having Schlafli symbols of the form {p,3} for any p>=2. That is, all regular tilings of polygons with two or more sides, where three tiles (puzzle faces) meet at a vertex. The Rubik's cube is the special case where faces are squares (p=4). The other familiar special cases are the Megaminx (p=5) and the Pyraminx (p=3), although you'll discover the last takes a slightly different form under this abstraction (akin to Jing's Pyraminx). All the other puzzles are new as far as I know, and some may be surprising, e.g. the puzzles based on digons (p=2). Each 2D tiling admits a particular constant curvature (homogeneous) geometry. The geometry is Spherical for p=2 to p=5, Euclidean (flat) for p=6, and Hyperbolic for p>=7. Since you can't "isometrically embed" the entire hyperbolic plane in 3-space, I have a connection to hyperpuzzling even though I'm talking about 2D tilings! " On Gravitation3D ;http://www.gravitation3d.com/ "Gravitation3D, an elegant and beautiful shareware program aimed at providing an intuitive understanding of the laws of gravity and having fun. Gravitation3D is an OpenGL based shareware program written for Microsoft Windows PCs. It started as a hobby project in July 2002, and quickly I could see from the excitement in friends and colleagues that it would be something worthwhile to share with others. After some more concentrated development work, it was first published on the web April 29th, 2003. The program provides a way for you to play the creator. You construct unique solar systems from scratch by adding gravitational bodies and configuring their starting properties. You then start your simulation and watch your systems evolve. Gravitation3D can provide hours of fun without even realizing you are learning! I already consider it a success because of the subtle insights I've gained from it. Gravitation3D is geared towards the physics, space, and math hobbyist. It is also an excellent educational tool, and would be perfect for generating interest in astrophysics, or for the high school or college physics teacher who wanted to develop lesson plans around it." "When it came to presenting the puzzles, what I chose to do was stereographically project them onto a flat plane from their respective geometries." Stuart Anderson