Day 1 - Your favorite video game
This is hard ;_; I think I'm going to have to go with The Legend of Zelda: Majora's Mask. Wait WHAT? Not Ocarina of Time? Nope! I loved Ocarina of Time, but the dark storyline that MM wove was just amazing. The world truly felt alive with all of the side quests too, and the NPCs just felt extremely real. The fact that they own had their own schedules and what you did had a big effect on them, plus how the worry for the crashing of the moon got more intense as your three days pressed onwards was fantastic. Plus all the masks you could screwed around with just added an entire new dimension for the games.