7. Colossal Cave (aka Adventure aka Classic Adventure) - Text based adventure, lead to MUDs.
8. Might & Magic - Secret of the Inner Sanctum (1st person dungeon RPG with only 90 degree turns)
9. Space Invaders (deserves a special mention cause of the number of "Shoot at the sky from your rocket ship" games it spawned - either with or without top-scrolling)