In our high school we'd download games like Tetris and Block Dude for our TI84s. You could transfer the games to other calculators with a data cable. High score

In our high school we'd download games like Tetris and Block Dude for our TI84s. You could transfer the games to other calculators with a data cable. High scores would transfer, and you might try to build a collection of games. A text based adventure game was going around with a Mafia setting including drugs, guns, and prostitutes. This one was banned by teachers with severe punishment if found, but I had liked the mechanics of the game and learned TI-Basic to recreate the game with a tamer pirate theme. This led to scripting calculations for Chemistry and hiding notes in the code written in the limited character set.