Guessed by S.Peelman
It's like GTA, but more mature - as in, actual mature, not "blood and black comedy" mature -, and that's a big reason I think of it more highly than I do GTA these days. It's been a while since I last played this game, but it was a memorable experience with several great characters, fun things to do, and a city map I feel I can remember entirely off the top of my head. It just had a really great vibe... I'm not sure when, if ever, I'll get around to playing this again, but for what it was, it was quite unforgettable.