I did Math HL and still got bored so I picked the affordable calculator on which I could play Solitaire, Tetris and Mario. CASIO calculators also had games and a friend sometimes lent me his CFX-9850+ (pictured) where I would code up Mastermind, TriPeaks and Snake in CASIO Basic, which was friendlier than TI-BASIC, as well as a manual image importing program. I later made a cable so I have them backed up to this day, I will publish them once I found the source.