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
How to Enter Diagnostic Mode (Hidden Feature on Casio Calculator, fx-83GT PLUS) | Calculator, Casio, Graphing calculator
I finally completed super mario bros deluxe on my calculator. : r/gaming
How to Download Games Onto a Graphing Calculator (with Pictures)
Casio graphic calculators - Wikipedia
Prism running on my calculator (Casio fx-CG50) : r/PokemonPrism