Shape King, Calculix, and Angie's Quest are all fun games available on Johnnie's Math Page. Johnnie's Math Page is a resource aimed toward students and teachers that allows them to hone their math skills in a fun way.
The website offers dozens of games that focus on a wide variety of mathematical skills ranging from arithmetic to calculus. There are also games that are available that focus on other logical skills, such as Chess, Reversi, and Domino. There is also a selection of games that focus on the mathematics of physics and games that allow students to simulate various physics principles.