Dad would study the manuals, input programs written in Basic (and published in magazines) into the PC as well as play Pac Man.
I would also write simple Basic programs to solve area, perimeter and surface area problems and play Lode Runner. Man, it was such a blast and did not require hours and hours to simply learn how to play.
The game was very simply: get your man to the top of the screen by digging holes to drop the enemies. The gameplay was very addictive.