GTA3 and GTA:VC have a mature sense of humor. As for mature gameplay, I have no idea what that is, but I think it's evident to anyone that has played these games that they have some of the best mission variation among any contemporary games. Rockstar has combined the driving and shooter genres into one game, interlaced the missions with story-driven cutscenes of twisted humor, and set the whole thing in an interesting, living, detailed, continuous level, and given it a completely open-ended format of play. Give it whatever adjectives you want, be it "mature" or not, but it's a great formula. While a lot of the story and cut-scenes consist of standard mobster and crime cliches, this is the first, or at least most successful, application of those cliches to a videogame. Subsequent titles of this new genre may have to become more sophisticated in that respect, but for GTA3 and GTA:VC it works well. Most mature gamers get a kick out of seeing allusions to Godfather, Goodfellas, Scarface, etc. in GTA3 and GTA:VC, movies that today's kiddies may not even have heard of.