Basically 101 Would be 10 of the Most popular and Revolutionary pre NES games.

First off, Some ARcade Games
Pac Man
Space Invaders

Then, Home Console Games
Pong - The first one ever to hit homes. (I might be wrong on this)

I can't think of many more Pre NES games though.

The next class, however, would be NES, SNES, and Genesis Titles.

The remaining class's would be from PS and N64 on.