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
5 Games That You Can Play On Your Calculator - YouTube
Got ahold of a Casio fx-991ex and CG-50 to match my Classpad II. I'm really impressed with them but there is something about the fx-991ex... (see comments) : r/calculators
What games can you play with just an ordinary calculator? - Quora
Casio fx-991ES Plus - solving quadratics - YouTube
fx-85ES PLUS 2nd edition | Non programmable | scientific calculator | CASIO