Play Euclid

[ysabetwordsmith]

Euclid is a geometry game that you can play online.  See a tutorial for it. One interesting feature is that you start out with a set of what they call "primitive" tools (line segment, ray, circle, etc.).  As you solve puzzles, you earn more advanced tools to automate certain functions, such as a triangle maker.  The game calculates the minimum number of moves required to solve a puzzle, as well as whether you're doing it right.