Saw this on an image board so made my own:
Zelda really was the defining game of my childhood, I remember spending hours upon hours playing through it and having my sisters watch. It set a gaming standard for me and I've followed and loved the series since.
Playing Half-Life multiplayer at secondary school brings fond memories back, but it was when I bought the game myself and played through the single player and all of its expansions that I realised FPS could have a great story too. I don't play many FPS games but this stands out as a defining game in the genre for me.
NIER is my most recent favourite game, and I refuse to trade it in as I may go back to it again soon. I love everything about it. The music, the story, the characters.....brilliant.
Red Dead Redemption is the game I have sunk most hours into (outside of a FIFA title) and has set a bar in my eyes for the standards of not just an open world game, but games in general.