Original Comment by: Captain Commando
http://Plenty more
Check out Ultima IV (or read about it in Dungeons and Dreamers as not too many people have time to slog through dungeon crawlers from the early 80s, as much as we might want to). Ultima IV introduced a virtue system where players had to consider the outcome of each action. So it wasn't just some hero going around with a good cause and yet slaying everything under the sun. Each town had its own set of virtues, too, so you had to figure out how things worked in the town and react accordingly. Wasteland was another early game that used this system. I would call this game one of the first that actually makes you think and that means the game can impact the player.
Earlier games like Pac Man have frequently had comments regarding how they are metaphor for capitalism. While we can certainly read these narratives in today, I am not entirely convinced this was the designer's initial intent. When Satoru Iwatani created Pac Man, he was basing the design off the concept of eating. Eating is the consumption of material to gain energy, and as a narrative of consumption, it translates fairly easily with the capitalist narrative of consumption. While I'd like to say Iwatani said this could have an allegorical content where it is not only a narrative of eating but as a narrative of consumption also a capitalist myth, I don't think that was the intent. These games certainly had a cultural impact, but whether it was an intentional impact but rather an incidental impact that I'm not convinced.