•    A fantastic app that allows you to make geometric constructions for geometry and graphs of functions for algebra.  Excellent for exploring mathematical concepts.
       A fun game where puzzles must be solved using geometric constructions.  Very intuitive and simple design (but it does get hard!).
    Khan Academy for Algebra and Geometry
       Same as the web resource, but put into an app for easy access. 
       A game about the order of operations. 
       A fun game about spatial relationships (slicing figures).