Back in the Gameboy Color days, when I was truly getting into gaming, I played my first RPG, which was Dragon Warrior I & II.
I love the first three Dragon Quests to no end. Even when I have games like FF VII and Twilight Princess, I repeatedly find myself, for reasons that I do not wholly understand, returning to a game with little storyline whose hours spent searching for orbs hidden in the most inconvenient places are numbered greatly. DW Monsters I don't know how much time I spent playing because the timer is maxed out. When DQ IX comes out, I will download the rom only because the game shall remain in the box at home.
And Tetris. I love Tetris. Tetris is like the Happy drug that balances out all of the depressingness that I mass from the rest of the games. I have the midi of the theme on my DS everywhere I go. It really is not possible to beat the immense, almost godlike wonder that is Tetris.