Mario bro's, Dig Dug, ect.
Keen was the 1st game for my own computer that had graffix and not text.
Anyone remeber a text only game that was like a cave / dungun thing and you could use flares to light up a 3x3 grid and you looked for treasure that was called "T"
Also a dragon game that I forget.
Best of all time, and 1st one played regulary had to be..... Oregon Trail!!