While SMB3 added quite a bit to the controls, SMW perfects them. Super Mario World also introduces Yoshi, who, although not always simple to find, can make traversing environments and defeating enemies much simpler. There's a great range of level types (and lots of content for each), and the game always manages to introduce new mechanics to keep the levels engaging. Exploration is really encouraged, with hidden levels like the Switch Palaces making changes to other levels (whether that be helpful platforms or access to secrets) - returning to levels with the Cape Powerup or Yoshi rarely seems like a waste of time. With a great range of colours and creative aesthetics, finally, this is a Mario game which I really love.