That was sort of my intro to programming as well, though decidedly less cool than a game.
I got really tired of typing out my physics equations by hand, and I was also bad at memorizing them for physics class, so I decided to cheat and write a program for the calculator that basically "plugged in" a lot of the equations for me.
It ended up being debateably useful, but honestly the act of writing the programs ended up actually being a reasonably good way for me to learn the equations anyway, so I kept it up throughout high school as a form of studying.
I loved writing programs like that during tests, really saved time for common operations. I was also very prone to mechanical errors so this saved me from that too. It was often easier in a multiple choice question to just have the calculator brute force the answers while I worked on the next problem. Totally permitted usage.
I got really tired of typing out my physics equations by hand, and I was also bad at memorizing them for physics class, so I decided to cheat and write a program for the calculator that basically "plugged in" a lot of the equations for me.
It ended up being debateably useful, but honestly the act of writing the programs ended up actually being a reasonably good way for me to learn the equations anyway, so I kept it up throughout high school as a form of studying.