GTA for sure, but I am torn between GTA 3 and GTA: SA. I've spent HOURS in GTA: SA even after finishing the game. The world was ridiculously expanded, considered, when the game premiered and there were also mods. One of the very few games I've spent more time in after finishing the main campaign than on finishing the campaign.
On the other hand GTA 3 holds even more nostalgia for me than GTA: SA. It was one of the very first games I ever played on my own computer. And it was objectively a great game for its times, so it's not just nostalgia - it was a freaking good game.
Cannot choose between those two, both remind me of good times, both were great during their pride, both I've spent days in.
My favorite GTA is Vice City. You have no idea how much I love that game! :)
forgot the entire gta series, my bad :) but definitely vice city at the top even though the graphics are bleeergh. just the style, feeling, gameplay and music are incredible. love gta 2, too
i guess i can kinda put all rogue-likes/lites in there too and just in general card games, no matter what it is really. unfortunately i can only really focus on one and the rest gets played just very occasionally even though i like a lot of them. don't have the time, man