Super Mario 64
Ranked in these QuestionsQuestion Ranking
Pro Developed a proper camera and control scheme for 3D games
3D games prior to Mario 64 were somewhat all over the place with their control schemes, and game developers were still struggling to use the third dimension they now had access to. SM64 is a freeform game that makes the most of its 3rd dimension with fantastic control and camera orientation that we take for granted these days, but was highly innovative in its own time.
Pro Free-roaming, open-world game
Super Mario 64, as a free-roaming, open-world game, was a precursor to later groundbreaking games such as Grand Theft Auto, and has been cited by Peter Molyneux as one of the 5 most groundbreaking games of the last 20 years for this reason