I've been trying to remember as far back as I could, and it occurred to me that there were plenty of games I had "beaten" with out any sense of accomplishment, such as many of my Atari 2600 games (Night Driver, anyone?) or say, Spy vs. Spy for the NES. And then there's the myriad of NES games that my good friend the Game Genie helped me beat, so I can't count those either. I'm almost positive the first full game I beat unaided was probably "Godzilla: King of the Monsters!" for the NES. I still play it regularly today, and being the Godzilla geek I am, I'm now amazed at all the in-references crammed into it.