So...to those asking about A level calculators. Our school forced us to get this model, the fx-cg50. It is expensive but incredible what can be done on it. Other games include Tetris
Casio Prizm (fx-CG) Games | Archives | Cemetech
How to Download Games Onto a Graphing Calculator (with Pictures)
How to Download Games Onto a Graphing Calculator (with Pictures)
Graphing calculator - Wikipedia
How to put games on your Casio FX-CG-20 calculator tutorial - YouTube