These could be games that left a lasting impression on you, games that had stellar gameplay mechanics, characters that captivated you, games that you played tons of hours on, etc.
and about a hundred more, probably. These are all on the ZX Spectrum. No one else start out in the early 80s with a Spectrum or Commodore 64 or Dragon or whatever?!
Looks like I'm one of the oldest here (Pacman guy presumably older)...