Barkley on 10 May 2018
Well as 95% of Nintendo Games are Sequels... this isn't really a very good question. xD
Should be limited to 2nd game in a series. In which case I'd say Smash Bros Melee as that was probably the biggest improvement over the original game.
Mario Party 2 and Mario Kart 64 are also both big improvements over their original games.
