Metroid for the NES
This is actually the first video game I remember buying with my own money. It just felt different (and maybe a bit more personal) playing a game that I had to save up for. Kind of made beating the game after countless hours/days/weeks that much more satisfying.
Metal Gear Solid 2: Sons of Liberty for the PS2
One of the most cerebral and emotional stories ever in a video game. It took everything that made the first MGS great and perfected it. I believe I was one of only two people who actually liked the character of Raiden at the time of MGS2’s release. This game is easily in my Top 3 favorites of all time. Also, best theme song ever.