High Quality Content by WIKIPEDIA articles! Calculator gaming is the phenomenon of programming and playing games on programmable calculators, especially graphing calculators. It is largely a pastime of high school and college students, who generally are required to use such powerful calculators in advanced mathematics classes; as a result, it is sometimes a clandestine activity done during class.A few games exist for even some of the earliest programmable calculators (including the Hewlett-Packard 9100A, one of the first full-fledged scientific calculators), including the long-popular Lunar Lander game often used as an early programming exercise. However, limited program address space and lack of easy program storage made calculator gaming a rarity even as programmables became cheap and relatively easy to obtain.