Minecraft - Was my absolute childhood and I met so many good friends and learnt a lot throughout my time playing the game.
Skate 2 - The controls are perfect, the vibe is amazing, it's just one of my overall favourites.
GTA V - The first R rated game I played. Both this game and Fallout 3 were massive inspirations for me focusing on 3D environments as a Game Dev student.
Honourable mention to Little Big Planet and Rollercoaster Tycoon Deluxe; both of which absolutely shaped my childhood
LITERALLY ME