Different people with different upbringings in different eras mean that everyone's going to have a different answer to the question.  For the record, when people ask me, I usually say Tetris. It's certainly not my favorite game of all-time, but if you look at its popularity and the wide-rangning effect it had on games, it always seems like the most logical answer.  Though GoldenEye is a somewhat common response for this list, ...