It was called "Water Carrier". It was a simple labyrinth game that - because I had no way of saving it to a tape, disk, or similar - I had to type in line by line whenever I wanted to play it.
Yes, I'm a bit longer in the business than most of you.
No, you bought magazines back then which had pages and pages of printed source that you typed in. And hoped that you didn't make mistakes. That's actually why I learned debugging before I learned to code ;)
And this also was the way I earned the money for my second computer - I wrote about 50 games on my own for my first one, some of which I sold to such magazines by saving them on casette tapes with a modified casette recorder. I wrote so many games, they published them under aliases...