People who are intelligent and have plenty of time on their hands can be the creators of some the most mind-blowing stuff. Take for instance Alex Marcolina, who spent three years making a Portal prelude on his scientific calculator. Alex is a game design major at UC Santa Cruz and it looks as if he is putting his degree to good use.
It's interesting to think that while I was using my TI-83 in high school, people were already thinking of ways to exploit its programming. I STILL COULD PLAY MARIO ON IT, THOUGH!
The source article has quite a bit of jargon on programming and coding, so I'll avoid trying to relay that information. Once they start talking about numbers and variables, I zone out.
I really wish I still had my scientific calculator.